Dual Nature of Matter and Radiation (BITSAT Physics): Questions 1 - 3 of 3

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Question number: 1

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

MCQ▾

Question

A black body radiates heat energy at the rate of 2×105Joule/sec/m2 at a temperature of 127oC . The temperature of the black body, at which the rate of heat radiation in 32×105Joule/sec/m2 is

Choices

Choice (4) Response

a.

927oC

b.

873oC

c.

273oC

d.

527oC

Question number: 2

» Dual Nature of Matter and Radiation » De-Broglie Relation

MCQ▾

Question

Which of the following does not change when light goes from one medium to another?

Choices

Choice (4) Response

a.

Intensity

b.

Speed

c.

Frequency

d.

Wavelength

Question number: 3

» Dual Nature of Matter and Radiation » Particle Nature of Light

MCQ▾

Question

A luminous efficiency of a lamp is 4lumenwatt and its luminous intensity is 30candela . The power of lamp is

Choices

Choice (4) Response

a.

78W

b.

136W

c.

60W

d.

94W

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