Dual Nature of Radiation MCQ with Answers

Dual Nature of Radiation MCQ with Answers

71) Work function of tungsten and sodium are 4.4eV and 2.3 eV respectively. If threshold wavelength of sodium is 5460A⁰, then threshold wavelength of tungsten is

Answer is:

2840 A⁰

Explanation:

Use 1/2mv²_max=hv??_? and W=hV_o

72) in photoelectric effect, the photoelectric current

Answer is:

does not depend on photon frequency but only on intensity of incident

Explanation:

in photoelectric effect, the photoelectric current does not depend on photon frequency but only on intensity of incident

73) If we consider electrons and photons of the same wavelength, then they will have the same

Answer is:

angular momentum

Explanation:

If we consider electrons and photons of the same wavelength, then they will have the same angular momentum

74) The work function of a metal is 4Ev. For emitting photoelectrons of zero velocity from the surface of this metal, the wavelength of incident light required must be

Answer is:

3100 A^o

Explanation:

Use 1/2mv²_max=hv??_? and W=hV_o

75) The curve drawn between velocity and frequency of a photon in vacuum will be a

Answer is:

straight line parallel to frequency axis

Explanation:

The curve drawn between velocity and frequency of a photon in vacuum will be a straight line parallel to frequency axis