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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 11501. |
Elaborate black body radiation..? |
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Answer» A body which observes radiations of different frequencies uniformly is called black body. The radiation emitted by such a body is called black body radiation. Practically no perfect black body exist. But carbon black is nearly close to a black body. The body which can prefactly absorb and emit radiation is called a black body . In nature there is no existence of black body which can prefactly emit and absorb radiation. The radiation emitted by a black body is called black body radiation The emission radiated by a black body is called black body radiation.A body which can absorb all the radiations of variable wavelengths is called black body Black body radiation: Black body is defined as perfect emitter and absorber of light.For example, whenever we heat an Iron ball like objects, on heating they become first Red, then Orange, then Yellow and at very high temperature they become White.According to the electromagnetic theory, the energy is emitted or absorbed continuously. So, the radiations emitted may vary in intensity, but should have same colour. The change in color shows, that wavelength also changes .This indicates non continuous flow of energy. So, it couldn’t be explained by electromagnetic theory. This phenomenon shows, that if we keep on heating the light that it emits. It will show changes in wavelength. That means the wavelength keeps on decreasing but after White there is no further change. |
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| 11502. |
What is falsification of theories????? |
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Answer» Mera fb me Ritesh Raj ( Ritt) name se h frnd request bhejo Chalate ho to kis name se ...bataoo Oye seraj tum Facebook chalate ho |
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| 11503. |
Derive and expression of collision in one dimension of inelastic collision? |
| Answer» An inelastic collision is such a\xa0type of collision\xa0that takes place between two objects in which some energy is lost. In the case of inelastic collision,\xa0momentum is conserved but the kinetic energy is not conserved. Most of the collisions in daily life are inelastic in nature.When two objects collide under inelastic condition. The final velocity with which object move is given by-V=(M1V1+M2V2)(M1+M2)Where,\tV= Final velocity\tM1= mass of the first object in kgs\tM2= mas of the second object in kgs\tV1= initial velocity of the first object in m/s\tV2= initial velocity of the second object in m/s | |
| 11504. |
HAPPY NEW YEAR ALLL OF YOUUUUU. ???be happy and jhakkash.????? |
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Answer» Same 2u ?why this? Same to you! ? |
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| 11505. |
Suhana right now answer what is your name . Else I will post your ids of other platforms here |
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Answer» Suhana mat likho bhai ?\u200d♀️ vo nhi hai... koi us name se id bna k thanks kar rha.... ? Rahul |
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| 11506. |
Newton\'s law of motion? |
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Answer» 1 law is that a body continues to be in its state of rest or motion untill and unless an external force is applied on it2 law is that rate of change of momentum of a body is directly proportional to force applied on it and directed as that of force.3law is that there is an equal and opposite reaction for every action. Konsa law 1 ,2 ya 3 ?? ??? |
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| 11507. |
Important derivation of gravitation |
| Answer» 1.Gravitational potential2.escape velocity3.gravitational potential energy4. Time period of satellite | |
| 11508. |
What is position time graph?draw the xt graph for the particle moving with uniform velocity |
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| 11509. |
I\'m not started any ch |
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Answer» R u kidding me ?? Why??? |
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| 11510. |
Help me in physics and chemistry |
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Answer» Physics wallah alakh pandey help you in physics and chemistry What type of hep you want |
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| 11511. |
why we consider only k. e in work done |
| Answer» We also consider potential energy | |
| 11512. |
Young\'s modulus of copper |
| Answer» Answer please first name | |
| 11513. |
Explain Stress strain curve? |
| Answer» Stress strain curves\xa0visually display the material\'s\xa0deformation\xa0in response to a tensile, compressive, or torsional load. Depending on the material being tested, a\xa0stress strain curve\xa0can indicate key properties of the material including its elastic region, plastic region, yield point, and ultimate tensile strength. | |
| 11514. |
Define gravitation potential energy |
| Answer» Energy stored when you lift an object against the force of gravity. For example - a car that is parked at the top of a hill. | |
| 11515. |
What is escape velocity? Derivation of escape velocity. |
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Answer» V.= Vnot Escape velocity is the velocity which is required to escape the earth\'s atmosphere |
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| 11516. |
What is origin of physics ? |
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Answer» Bro read through physics wallah Physics is a branch of science whose primary objects of study are matter and energy. Discoveries of physics find applications throughout the natural sciences and in technology, since matter and energy are the basic constituents of the natural world. questions and curiosity are the origin of physics |
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| 11517. |
The dimensions of Modulus of rigidity is |
| Answer» N/ m² | |
| 11518. |
Varnier callipers table in manual labor book |
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| 11519. |
Relationship between stress and strain |
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Answer» Stress is directly proportional to strain Stess is directly proportional to the strain within elastic limit, according to Hooke Stress is directly proportional to strain |
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| 11520. |
While lift is in free fall movement does gravitational force is absent |
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Answer» No NoIn freefall movement gravitational force (g) acts that\'s why they are falling freely No during free fall, gravitational force is cancelled due to our applied force |
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| 11521. |
Write the type of vector |
| Answer» Types of vetor are given below1) Unit vector2) Equal vector3) Negative vector4). Coinitial vector5) Coplaner vector6) Colinear vector7) Opposite vector | |
| 11522. |
if the moment of the body increase a50 per sent whose is percent change in kinetic energy |
| Answer» 1.25 × 10^2 | |
| 11523. |
Derivation of average kinetic energy per molecule of the gas |
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| 11524. |
Prove that the gravitational force is a conservative force ? |
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| 11525. |
estimate the size of an oleic acid molecule |
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| 11526. |
Y= x2+ 1/x2 + 1/ sinx . Find the differentiation |
| Answer» -2/x^3 + 2x - cot(x).cosec(x) | |
| 11527. |
Difference between conservative and non conservative force |
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Answer» Conservative force -Those forces whose work done is not dependent on the nature of path taken it only depends on initial and final positions .eg- Gravitational force, elastic force, magnetic force.Non conservative force-Those forces whose work done is dependent on initial and final positions as well as on the nature of path taken.Eg- frictional force ,viscous force • Conservative force - Gravitational force• Non-Conservative force - Friction force ?Conservative force :- A force is aid to be conservative if workdone by or against the force in moving a body depends only on initial and final point and not on the nature of path .Eg, gravitational force ?Non conservative force :- A force is said to be non conservative if workdone by or against the force in moving a body depends on path between initial and final point . Eg, friction force etc. O dontknow Conservative force - The force through which the work done between the two points is path independent is called conservative force. Non-Conservative Force - The force through which the work done between the two bodies is path dependant is called non conservative force. |
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| 11528. |
During propagation of longitudinal waves through a medium the quantity /quantities transmitted is |
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Answer» Energy Energy Energy |
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| 11529. |
इस अर्थ वेयर to श्रिंक suddenlyव्हाट व् हैपन टू द लेंथ ऑफ द डे एक्सप्लेन |
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| 11530. |
Parallax method....? |
| Answer» Parallax is the displacement or the change in the apparent position of the object when viewed from two different points of view. The two points of view have their own line of sights and parallax is measured as half of the angle between the two lines of sights.When you are traveling in a vehicle and you look around as you are moving, you will see that objects in the distances appear to move more slowly than the objects closer to you. This is the effect of parallax. Nearby objects have a larger parallax than the distant objects, so the parallax can be used to determine distances.The phenomenon of parallax, when combined with triangulation, will yield the location of the object with considerable accuracy. Astronomers regularly use the parallax method to measure the distances of the closer stars.Distance Measurement by ParallaxDistance measurement by parallax is a special application of the principle of triangulation. From triangulation, we knew that a triangle can be described completely if two angles and sides are known.In the image shown above, the distance of a distant star is being calculated. The star being closer to earth than the far away starts exhibits a finite parallax value. This way, we can obtain the value of the parallax angle by viewing the star from two known points on Earth forming the baseline of the triangle.Let’s define the parallax half-angle from two distinct points on Earth as ‘p’. Here the maximum value of‘ ‘d’ is the radius of Earth and the distance of the star can be assumed to be only slightly farther than the sun. Here the value of the distance from the sun is many magnitudes smaller than the radius of the earth due to which the value of the parallax angle we get is extremely small. Too small to be even detected.This is the fact behind, why the great Astronomer Cassini and his colleagues were unsuccessful in finding the parallax for even a single star. This was considered by his detractors to be proof that heliocentricity was wrong. Cassini’s theory was correct but the least count of the equipment used then wasn’t small enough.ApplicationAssuming the angle ‘p’ is small, the distance to the object measured in parsecs (in terms of speed of light) is equal to the reciprocal of the parallax angle measured in arcseconds.D(parsec)=1p(arcsec)In order to overcome the problem of the small ratios, star parallax is most often measured using annual parallax which is defined as the difference in the position of a star as seen from the earth and sun. Instead of taking the fixed baseline as the Earth’s radius, the fixed baseline is taken as the radius of\xa0Earth’s revolution\xa0around Earth which increases the size of the baseline therefore the top angle making it easier to measure.Measurement of stellar distances and the parallax angle in terms of distancesUnfortunately, the ground-based telescopes can only measure parallax reliably for stars that are within a few hundred light-years from us. Telescopes above the atmosphere such as the Hubble Telescope can measure smaller parallax shifts and thus larger distance, but even in that case the most distant objects for which distance can be determined by parallax of a few thousand light-years away. To measure further distances, we use other methods which you will learn in the coming classes. | |
| 11531. |
3 law of motion |
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Answer» 1) when a object is in motion or rest it will always be in motion/rest untill external force is applied to it2) Momentum varies directly with applied force w.r.t time3) For every action there is opposite reaction Every action there is an equal and opposite reaction Physics wallah ki video se samajh lo |
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| 11532. |
Show that for small osullations motion of a pendulum is in S.H.M |
| Answer» A\xa0pendulum\xa0moves in such a way that angle is formed by it is θ , as you know , along tangent ,\xa0motion\xa0of\xa0pendulum\xa0is just opposite to force. As\xa0shown\xa0in figure. Here what you see both the above conditions are satisfied when displacement of\xa0pendulum\xa0is\xa0small. | |
| 11533. |
Relation between acceleration displacement and frequency of a particle executing in SHM |
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| 11534. |
What is hookes law |
| Answer» The law states that for small deformation in a spring or string the stress is directly proportional to strain.Stress⟨ strain≈stress =k strain Where k is called modulus of elaticity | |
| 11535. |
KYA YHA PAR KOI PHYSICS WALLAH KA STUDENT HAI ❓❓ |
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Answer» Yupp Yes I am here What your task Hmm... Hmm ✋ |
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| 11536. |
what is the important of Radical field |
| Answer» The radial magnetic field is applied to a moving coil galvanometer to produce a constant torque on the coil. It is applied to measure the relation between the current and the angle which is non-linear such that the current cannot be measured easily. | |
| 11537. |
State and prove bernoulli\'s principle |
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Answer» Physics is the branch of science which study about the nature and natural phenomena What is physics |
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| 11538. |
Write the position of centre of mass of two particle system |
| Answer» m1x1+m2x2/m1+m2 | |
| 11539. |
Write the dimension and SI unit of linear momentum. |
| Answer» SI unit is Kg.m/secDimension is(ML/T) | |
| 11540. |
Discuss the effect of temperature and density on the velocity of sound in aor |
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| 11541. |
Is manav ko ya se baga do |
| Answer» ? | |
| 11542. |
State the principal on which hydraulic lift work and explain its working |
| Answer» It works on Pascal\'s principal,according to this the pressure exerted in a fluid is transmitted equally in all directions. | |
| 11543. |
Why water has maximum specific heat capacity ...?¿ |
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Answer» Good morning ? Phirr to aapka shi h ...same here 11 ?......good morning ? 11 ne halat khrab kr di?? Thank you...haan 11 k exams ho gaye aur pass bhi karva diya sabko bina marks bataye..?5 se 12 shuru , |
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| 11544. |
Write the dimensions and si units of linear momentum |
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Answer» SI unit= kgm/s Dimension - MLT-1 |
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| 11545. |
Yrrr guy\'s kl physics ka exam h bht ganda wala dr lg rha |
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Answer» Hnn hoping so ki Acha hi ja Are dro mt bs pdo jitna pd skte ho na bss utna hii jyada mind ko stress mt do bilkul daro mat Vanshika..... tumahara exam bohot acchha jaega....bas formulas ko revise karte raho. Final term Ka exam h yrr Dar kyu rhi ho.jake padho fresh mind se. |
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| 11546. |
List of compulsory and optional subjects in class 11 PCM |
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| 11547. |
What are Derivatives |
| Answer» In finance, a derivative is a contract that derives its value from the performance of an underlying entity. This underlying entity can be an asset, index, or interest rate, and is often simply called the "underlying". | |
| 11548. |
What is differential calculus |
| Answer» a branch of mathematics concerned with the determination, properties, and application of derivatives and differentials. | |
| 11549. |
What are hypothesis axioms and models |
| Answer» Hypothesis,\xa0Axiom and Models.\xa0Hypothesis\xa0is a supposition without assuming that it is true. It may not be proved but can be verified through a series of experiments.\xa0Axiom\xa0is a self-evident truth that it is accepted without controversy or question.\xa0Model\xa0is a theory proposed to explain observed phenomena. | |
| 11550. |
Two forces P and Q acting at a point at an angle theta how their resultant (2n+1) |
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