Dual Nature of Matter and Radiation-Black-Body Radiation (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 1 - 3 of 3

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Question number: 1

» Dual Nature of Matter and Radiation » Black-Body Radiation

Appeared in Year: 2011

MCQ▾

Question

The total radiative power emitted by spherical blackbody with radius R and temperature T is P. If the radius is doubled and the temperature is halved then the radiative power will be

Choices

Choice (4) Response

a.

4P

b.

P2

c.

2P

d.

P4

Question number: 2

» Dual Nature of Matter and Radiation » Black-Body Radiation

Appeared in Year: 2012

MCQ▾

Question

The total energy of a black body radiation source is collected for five minutes and used to heat water. The temperature of the water increases from 10.00C to 11.00C. The absolute temperature of the black body is doubled and its surface area halved and the experiment repeated for the same time. Which of the following statements would be most nearly correct?

Choices

Choice (4) Response

a.

The temperature of the water would increase from 10.00C to a final temperature of 140C

b.

The temperature of the water would increase from 10.00C to a final temperature of 180C

c.

The temperature of the water would increase from 10.00C to a final temperature of 120C

d.

The temperature of the water would increase from 10.00C to a final temperature of 110C

Question number: 3

» Dual Nature of Matter and Radiation » Black-Body Radiation

MCQ▾

Question

A black body radiates heat energy at the rate of 1×105Js1m2 at 1150C. The temperature of the black body, at which the rate of heat radiation is 81×105Js1 , will be –

Choices

Choice (4) Response

a.

2730 C

b.

5270 C

c.

8910 C

d.

9270 C

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