1) Which of the following statements is inconsistent with the quantum picture of

Question

1) Which of the following statements is inconsistent with the quantum picture of light?

a) The emission spectrum of a blackbody does not depend on the composition of the blackbody if it is in thermal equilibrium.

b) Laser light is comprised of discrete packets having definite energy and momentum.    

c) The stopping potential for electrons ejected from an illuminated metal depends on the wavelength and intensity of the light.

d) Laser light illuminating a double-slit apparatus produces an interference pattern.

e) It is impossible to observe a interference pattern with a double slit apparatus using a light source which occasionally emits a single photon.

2) Consider blackbody radiation. Which of the following statements is incorrect?

a) Cosmic radiation has a background component which has the features of a blackbody spectrum corresponding to a temperature of 2.7 Kelvin.

b) A blackbody is defined as an object which absorbs all radiation incident upon it.    

c) The total intensity of a blackbody emitter is proportional to the fourth power of the absolute temperature.

d) If one increases the temperature of a blackbody from 100 degrees Centigrade to 200 degrees Centigrade, the wavelength at which the intensity of the blackbody spectrum peaks decreases by a factor of two.

e) The quantum theory of radiation and the classical theory of radiation disagree on the blackbody spectrum at short wavelengths.

f) The blackbody spectrum can be used to determine Planck's constant.

Explanation / Answer

Answer 1 )

part a is inconsistent

The emission spectrum of a blackbody does not depend on the composition of the blackbody if it is in thermal equilibrium is is inconsistent with the quantum picture of light.

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