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For a perpendicular vector.. the dot product should be 0.

so only option is 2.

as dot product is. (Acos∅)(Bsin∅) -(Asin∅)(Bcos∅) = ABsin∅cos∅ -ABsin∅cos∅ = 0

from the change in velocity , we find acceleration as 6-5/2 = 1/2m/s² now , the force is 0.6N so the mass is = 0.6/0.5 = 1.2kg

tq

Dimension of bx and ct is null. This implies that dimension of b is the inverse of that of X, which is [L] and the dimension of c is the inverse of that of t, which is [T]. So, dimension of b is [L-¹] and dimension of c is [T-¹].Thus, dimension of bc is [L-¹ T-¹].

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The Schrodinger equation plays the role ofNewton's lawsandconservation of energyin classical mechanics - i.e., it predicts the future behavior of a dynamic system. It is a wave equation in terms of thewavefunctionwhich predicts analytically and precisely the probability of events or outcome. The detailed outcome is not strictly determined, but given a large number of events, the Schrodinger equation will predict the distribution of results.

The Schrodinger equation is used to find the allowed energy levels of quantum mechanical systems (such as atoms, or transistors). The associated wavefunction gives the probability of finding the particle at a certain position.

wavefront is termed as the locus of all the points joining together woth same phase, a line or curve in 2dimensional

wheras a wavelet is defined as: a wave like oscillation with ampliyude expanding and contracting gradually and sequentially.

the locus of all the points of the medium which receives disturbances simoultaneously and are in same state of vibration are called as wavefront .every point on a wavefront act as a new source called as secondary wavelets .wavelets are just a kind of daughter wave u can say .more precisely , wavelets is small wave like oscillation , which starts with zero displacement , increase to max . displacement , then decrease to zero again .

power = 1/ focal lengthpower = 1/ 25 = 0.04 dioptre

You need to use this procedure to solve.

Here, it is given that the block A is at rest. So the pulley attached to masses m and 2m must also be at rest because string is ideal(i.e. inelastic and massless). So for this pulley, total downward force(mg+2mg) is equal to total upward force(tension T=mass of A*g).So, mass of A=(1+2)m=3m.

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A solid substance that allows heat or electricity to pass through it or along it in particular conditions

Asemiconductormaterial has anelectrical conductivityvalue falling between that of aconductor, such as metallic copper, and aninsulator, such as glass. Itsresistancedecreases as its temperature increases, which is behaviour opposite to that of a metal. Its conducting properties may be altered in useful ways by the deliberate, controlled introduction of impurities ("doping") into thecrystal structure. Where two differently-doped regions exist in the same crystal, asemiconductor junctionis created. The behavior ofcharge carrierswhich includeelectrons,ionsandelectron holesat these junctions is the basis ofdiodes,transistorsand all modernelectronics. Some examples of semiconductors aresilicon,germanium,gallium arsenide, and elements near the so-called "metalloid staircase" on the periodic table. After silicon, gallium arsenide is the second most common semiconductor[citation needed]and is used in laser diodes, solar cells, microwave-frequency integrated circuits and others. Silicon is a critical element for fabricating most electronic circuits.

Semiconductor devicescan display a range of useful properties such as passing current more easily in one direction than the other, showing variable resistance, and sensitivity to light or heat. Because the electrical properties of a semiconductor material can be modified by doping, or by the application of electrical fields or light, devices made from semiconductors can be used for amplification, switching, andenergy conversion.

The conductivity of silicon is increased by adding a small amount (of the order of 1 in 108) of pentavalent (antimony,phosphorus, orarsenic) or trivalent (boron,gallium,indium) atoms. This process is known as doping and resulting semiconductors are known as doped or extrinsic semiconductors. Apart from doping, the conductivity of a semiconductor can equally be improved by increasing its temperature. This is contrary to the behaviour of a metal in which conductivity decreases with increase in temperature.

The modern understanding of the properties of a semiconductor relies onquantum physicsto explain the movement of charge carriers in acrystal lattice.[1]Doping greatly increases the number of charge carriers within the crystal. When a doped semiconductor contains mostly free holes it is called "p-type", and when it contains mostly free electrons it is known as "n-type". The semiconductor materials used in electronic devices are doped under precise conditions to control the concentration and regions of p- and n-type dopants. A single semiconductor crystal can have many p- and n-type regions; thep–n junctionsbetween these regions are responsible for the useful electronic behavior.

Some of the properties of semiconductor materials were observed throughout the mid 19th and first decades of the 20th century. The first practical application of semiconductors in electronics was the 1904 development of thecat's-whisker detector, a primitive semiconductor diode used in early radio receivers. Developments in quantum physics in turn allowed the development of thetransistorin 1947,[2]theintegrated circuitin 1958, and theMOSFET(metal–oxide–semiconductorfield-effect transistor) in 1959.

solid substance that allows heat or electricity to pass through it or along it in particular conditions

अर्धचालक (विशिष्‍ट दशाओं में ताप या विद्युत का चालन करने वाला एक ठोस पदार्थ); सेमिकंडक्‍टर

Since, all the vertices have identical spheres, the centre of mass is at the intersection of diagonals. Hence, the centre of mass is at ORIGIN .

option (a) is correct.

Indirect current(DC), the electric charge (current) only flows in one direction. Electric charge inalternating current(AC), on the other hand, changes direction periodically. The voltage inACcircuits also periodically reverses because the current changes direction.

thnx

ACandDCare different types of voltage or current used for the conduction and transmission of electrical energy. ... According to Karl K. Berggren, professor of electrical engineering at MIT, the fundamentaldifference between ACandDCis the direction of flow.DCis constant and moves in one direction.

u=-30cmf=-60cm1/v + 1/u = 1/f1/v + 1/-30 = 1/-601/v = -1/60 + 1/301/v = -1/60 + 2/601/v = 1/60v = 60cm

the horizontal component of velocity always remains constant which is equal to ucos60=u/2

1)Electrical resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ.

2)A lowresistivityindicates a material that readily allowstheflowof electriccurrent.

Resistivityis commonly represented bytheGreek letter ρ (rho).

TheSIunit of electrical resistivityistheohm-metre (Ω⋅m).3)In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 100mA.

The reading of the ammeter decreases to half when the length of the wire is doubled.

Hence according to ohms law for a given potential difference, the current reduces to half.

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Electrical resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. SI unit: Siemens per meterIn a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 100mA. The reading of the ammeter decreases to half when the length of the wire is doubled. ... Hence according to ohms law for a given potential difference, the current reduces to half.

Electrical resistivity quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge.

Ammeter is used to measure electrical charge within a circuit. Since resistivity is directly proportional to the length of wire, when the length of wire is doubled, the wire retards the flow of charge twice more forcefully. So electric current decreases due to decrease in rate of flow of charge. Hence, the reading in ammeter decreases to half.

1)Electrical resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ(Rho).

2.)TheSIunit of electrical resistivityistheohm-metre (Ω⋅m).3.)In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 100mA. The reading of the ammeter decreases to half when the length of the wire is doubled. ... Hence according to ohms law for a given potential difference, the current reduces to half.

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Difference will be 0as both are in seriesand same current will flow so no difference in reading

Current = V/R= 12+12/6= 24/6= 4 amp

As in parallel = 24*24/24+24= 12 ohmnow 12+12= 24 ohm

Theradius of curvatureispositive(20 cm) fora concave mirror.

f=+15 cm

because its a convex lens

R=2F

R=30cm

D¹*D¹:D²*D² 4:1 kese hua..?

Minimum resistance is observed when they are connected in parallel (you can take it as a thumb rule that the resistance of a group of resistors connected in parallel will be less then the minimum resistance present in the group)

thus net resistance 1/R = 1/R1 + 1/R2 + .... and so it can be calculated to be 1/25

Height of object ho = 9 cm

Focal lenght of convex lens = ? cm

Object distance u = -90 cm

Image distance v = 30 cm

Image height hi = ?

Lens formula: 1/v - 1/u = 1/f

1/f = 1/v - 1/u

= 1/30 + 1/(-90)

= -1/45

⇒ v = - 45 cm

The image distance is 45 cm on the same side of the lens as the object.

Magnification m = v/u = (-45)/(-90) = 1/2 = hi/ho = hi/9

⇒ hi = 9/2 cm

3 ohm+7 ohm= 10 ohm शिरीष ज्वाइंट1/10 ohm + 1/10 ohm= parallel joint1/5 ohm= 1/rr= 5 ohmthan5 ohm + 5 ohm + 5 ohm =15 ohm15 ohm ans..

15 ohm is the correct answer

answer of following is 15 ohm.

total resistance will be 1 ohm. if five resistance are connected parallel.

five resistance each of resistance 1 ohm are connected in parallel :-1/1+1/1+1/1+1/1+1/1= 5/1=5

Resistance R = 8 ohmlet's take length as Land cross section area as A

here we need to use the formula R= rho(L/A) here rhostands for resistivity

as length is halved and r the radius is increased by two R is reduced to R/4=8/4=2 ohm

so new resistance will be 2 ohm

In starting 2amp current from both branch get added and 4 amp current flows through straight line which divided into two branches of 1 amp and 3 amp. Which further divided into 1.3 amp and 1.7amp

Thus right ans is 1.7 amp