Q. 4

The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is
A.

B.

C.

D.

Answer :

Given


Power of the bulb P �1 = 100 W


Distance of the bulb from the point of observation = 3 m


Intensity of the radiation from bulb 1, I1 = E


Power of the second bulb P2 = 50 W


Explanation:


We know that, the intensity of radiation is given,



Where W is the energy emitted by the bulb, t is the time, and A is the area on which the radiation is incident. Intensity can also be expressed in terms of power P,





Therefore,





Therefore electric field intensity produced by the 50 W bulb is .

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