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Heat capacity: The amount of heat required per unit rise of temperature is called heat capacity. Heat capacity = Qt∆∆ Specific heat: “As the quantity of heat required by unit mass of the material to rise its temperature by one degree” is called specific heat. Specific heat s = Qm t

The creation of all electromagnetic waves begins with a charged particle. This charged particle creates an electric field (which can exert aforce on other nearby charged particles). When it accelerates as part of an oscillatory motion, the charged particle creates ripples, or oscillations, in its electric field, and also produces a magnetic field.

Once in motion, the electric and magnetic fields created by a charged particle are self-perpetuating—time-dependent changes in one field (electric or magnetic) produce the other. This means that an electric field that oscillates as a function of time will produce a magnetic field, and a magnetic field that changes as a function of time will produce an electric field. Both electric and magnetic fields in an electromagnetic wave will fluctuate in time, one causing the other to change.All the above sources of electromagnetic waves use the simple principle of moving charge

About 150 years ago,James Clerk Maxwell, an English scientist, developed a scientific theory to explain electromagnetic waves. He noticed that electrical fields and magnetic fields can couple together to form electromagnetic waves.

latent heat =option cspecific heat capacity =option d

Electric and magnetic fields oscillates in e.m waves.eg: Radio waves, Light

Yes electromagnetic waves carry both energy and momentum because

The energy carried by an electromagnetic wave is inversely proportional to its wavelength: E=hλ.

The momentum carried by an electromagnetic wave is proportional to its energy: p=Ec.

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BA, CC, DE, EG, FI, GK,? Ans is (c) HM

Objects in space, such as planets and comets, giant clouds of gas and dust, and stars and galaxies, emit light at many different wavelengths. ... Becauseradio wavesare larger than opticalwaves,radiotelescopes work differently than telescopes thatwe usefor visible > light (optical telescopes).

Magnification,m= -1Distance between object and image, u + v = 60 cm

Magnification (m) is given bym=vu⇒−1=vu⇒v=−u

Now, we have,−u+v= 60⇒−u−u=60⇒−2u=60⇒u=−30cmSo,v=−(−30)=30cmUsing lens formula1v−1u=1f⇒1f=130−1−30=230⇒1f=115⇒f=15cm

this is another representation of wheat-stone-brige. type circuit...

in which we can remove the middle 6μF capacitor.

and the remaining 4 will make pair between them in parallel..

so, the parallel equivalent C = 6+6 = 12μF for both pairs

now theses are connected in series..therfor Ceq = 12*12/(12+12) = 144/24 = 6μF.

v=-30cm will be right answer

Answer: b) Real and invertedexplanation :The real and inverted image formed on the retina is carried to the brain by the optic nerve in the form of electrical signals. The brain interprest these signals and processes the information such that we see the objects erect.

5 object between f and p 6 object on c7 object is placed on infinity

CorneaThe clear outer part of the eye's focusing system located at the front of the eye.

FoveaThe center of the macula; gives the sharpest vision.

IrisThe colored part of the eye that regulates the amount of light entering the eye.

LensA clear part of the eye behind the iris that helps to focus light, or an image, on the retina.

MaculaThe small sensitive area of the retina that gives central vision. It is located in the center of the retina and contains the fovea.

Optic NerveA bundle of more than one million nerve fibers that carries visual messages from the retina to the brain.

PupilThe opening at the center of the iris. The iris adjusts the size of the pupil and controls the amount of light that can enter the eye.

RetinaThe light-sensitive tissue lining at the back of the eye. The retina converts light into electrical impulses that are sent to the brain through the optic nerve.

Vitreous GelA clear gel that fills the inside of the eye.

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bile juice is secreted by the liver.bileincreases the absorption of fats, it is an important part of the absorption of the fat-soluble substances, such as the vitamins A, D, E, and K. Besides its digestive function,bileserves also as the route of excretion for bilirubin, a byproduct of red blood cells recycled by the liver.

juice is secreted by the liver =bilebile increase the absorption of fats.it is an important part of the absorption of the fat-soluble substances

Bile juice is secreated by the liver it helps to digest food

bile juice is secreted by the liver it increase absorption of fat

bile juice is screted by liver

When experimenting the reflexive properties of light using a convex lens we observe that the nature of the image formed depends entirely on the distance of the object which in this case is the candle

When the focal length is longer then the image formed is real and equal sized and inverted.

(a) To obtain a real and inverted image of same size we must use CONVEX LENS.In a convex lens when object is held at 2f than the image is formed real and inverted.

(b) Focal length of the lens is 2 m.Distance of candle flame from the lens is 4 m.

(c) Ray Diagram

Converging lens or Convex lens should be used by the user to project the image of candle on the wall as he wants it to be three times magnified.

Reason:In Convex lens, when object is placed between F and C , the image will be formed beyond C .Nature of Image :--> magnified, real and inverted.hi=3hoImage distance= object distance + 6v=6+uwe know that magnification=m=v/um=v/u-3=v/u[since image is magnifed three times ]-3=6+u/u-3u=6+u4u=-6u=-6/4u=-1.5 mv=6-(-1.5)v=7.5mby using lens formula,1/f =1/v-1/u1/7.5 +1/1.5=1/f10/75+10/15=1/f10+50/ 75=1/f∴ f=75/60=1.25mThus, Focal length of a given convex lens is 1.25m

how u =-5

we know that the focal length is given as1/f = 1/v + 1/uso,1/f = 1/50.1 + 1/20.1or1/f = 1/0.0697thus, the focal length will bef = 14.34 cmthus, the corresponding error equation would beΔf/f = Δu/u + Δv/vso,Δf = f.(Δu/u + Δv/v)orΔf = 14.34 [(0.1/20.1) + (0.2/50.1)]

orΔf = 14.34 [0.00497 + 0.00399]

thus,

Δf = 0.13so, the final value is

f +- Δf = 14.34 +- 0.13 cm

Object distance , u= -60cm

Focal lenght , f =-10cm

Object size = 5 cm

v =?

Mirror formula,

1/v + 1/u = 1/f

1/v = 1/u - 1/f

1/v= 1/-(60) +1/-(10)

1/v = -1+6/60

1/v = -5/60

1/v = -1/12

v = -12

Image position = -12

Size of the image,

Magnification , m= -v/u

m = -(-12)/-60

m = 12/-60

m = 1/-5

m= -0.2

Then ,

m = h'/h

-0.2= h'/5

-0.2 × 5 = h'

h' = -1

Kinectic Energy = I(w^2) /2

Where, I = moment of inertiaw = angular speed

I(w^2) = 360*2

I = 720/20*20

I = 1.8 kg m2

(b) is correct option

answer of this question is b

B is the right answer

A PN-junction diode is formed when a p-type semiconductor is fused to an n-type semiconductor creating a potential barrier voltage across the diode junction. APN Junction Diodeis one of the simplest semiconductor devices around, and which has the characteristic of passing current in only one direction only. However, unlike a resistor, a diode does not behave linearly with respect to the applied voltage as the diode has an exponential current-voltage (I-V) relationship and therefore we can not described its operation by simply using an equation such as Ohm’s law.

If a suitable positive voltage (forward bias) is applied between the two ends of the PN junction, it can supply free electrons and holes with the extra energy they require to cross the junction as the width of the depletion layer around the PN junction is decreased.

By applying a negative voltage (reverse bias) results in the free charges being pulled away from the junction resulting in the depletion layer width being increased. This has the effect of increasing or decreasing the effective resistance of the junction itself allowing or blocking current flow through the diode.

Then the depletion layer widens with an increase in the application of a reverse voltage and narrows with an increase in the application of a forward voltage. This is due to the differences in the electrical properties on the two sides of the PN junction resulting in physical changes taking place. One of the results produces rectification as seen in the PN junction diodes static I-V (current-voltage) characteristics.

A pn junction diode is said to be in forward bias when the anode is at higher potential than that of cathode.

A pn junction diode is said to be in forward bias when the anode is at higher potential than that of cathode.

The p side is anode, and n side is cathode.

So, (ii) is in forward bias.

(2) right answer s%%%%%

2) is the correct answer

Height of object ho = 4 cm

Focal lenght of convex mirror = ? cm

Object distance u = ? cm

Image distance v = 60 cm

Image height hi = 2 cm

Magnification m = hi/ho = 2/4=1/2

v/u = 1/2

60cm/u = 1/2

u = 120 cm

mirror formula: 1/v + 1/u = 1/-f

1/-f = 1/v + 1/u

= 1/60 + 1/120

= 3/120 = 1/40

⇒ f= -40 cm

reverse baising of pn junction offers very high resistance

the correct option is (a)

How you eddited that photo

Velocity of jet plane with respect to ground, vJ= 500 km/h

Velocity of exhaust with respect to jet plane, vEJ= −1500 km/h

Using the equation of relative velocity,

vEJ= vE- vJ

-1500 = vE- (500)

vE= -1000 km/h

Hence,Speed of Exhaust w.r.t. ground = 1000 km/h

Potato

Many plants have underground modified stems that may be mistaken for roots. Examples of underground stems include corms, such as taro (left); rhizomes, such as ginger (center); and tubers, such as potatoes (right).Thus iloption b is correct.

1. Use of alternative sources of power such as solar and wind energy.

2.Plant trees to prevent soil erosion.

3.Practicing of judicious ways to conserve water in our homes.

4.Use pipelines to transport oil.

5.Growing of vegetation in catchment areas.

-The magnetic field intensity at any point is defined as the force experienced by the point when placed under the influence of an external magnetic field. -Tesla is the SI unit

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