CSIR Physical Sciences: Questions 164 - 166 of 401

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Question number: 164

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2014

MCQ▾

Question

A non – relativistic particle of mass m and charge e, moving with a velocity v and acceleration a , emits radiation of intensity I . What is the intensity of the radiation emitted by a particle of mass m2, charge 2e , velocity v2 and acceleration 2a ? (December)

Choices

Choice (4) Response

a.

8I

b.

2I

c.

16I

d.

4I

Question number: 165

» Electromagnetic Theory » Diffraction

Appeared in Year: 2014

MCQ▾

Question

When laser light of wavelength λ falls on a metal scale with 1 mm engravings at a grazing angle of incidence, it is diffracted to from a vertical chain of diffraction sports on a screen kept perpendicular to the scale. If the wavelength of the laser is increase by 200 nm, the angle of the first – order diffraction spot changes from 50 to – (December)

Choices

Choice (4) Response

a.

5.140

b.

5.210

c.

5.0180

d.

6.600

Question number: 166

» Electronics and Experimental Methods » Opto-Electronic Devices » Solar Cells

Appeared in Year: 2014

MCQ▾

Question

The power of density of sunlight incident on a solar cell is 100mWcm2 . Its short circuit current density is 30mAcm2 and the open circuit voltage is 0.7 V. If the fill factor of the solar cell decreases from 0.8 to 0.5, then the percentage efficiency will decrease from (December)

Choices

Choice (4) Response

a.

16.8 to 10.5

b.

24.0 to 16.8

c.

42.0 to 26.2

d.

21.0 to 10.5

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