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Objective Questions
GS
GS Set-1
Physics
Dual Nature of Radiation
34

Dual Nature of Radiation MCQ with Answers

34) Light of wavelength 4000?A⁰?is incident on a metal plate whose work function is 2 eV. The maximum kinetic energy of the emitted photoelectrons would be

0.5eV

1.5 eV

1.1eV

2.0eV

Answer is:

1.1eV

Explanation:

use W=hV_o and E = hc/(/lambda)

Dual Nature of Radiation MCQ with Answers

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Related Dual Nature of Radiation MCQ with Answers

35) Given h = 6.6??10^?34?joule sec, the momentum of each photon in a given radiation is 3.3??10^?29?kg metre/sec. The frequency of radiation is

1.7??10¹³?Hz

1.8??10¹³?Hz

1.5??10¹³?Hz

1.6??10¹³?Hz

Answer is:

1.5??10¹³?Hz

Explanation:

use de brogli formula

36) If?10⁹?electrons move out of a body to another body every second, how much time is approximately required to get a total charge of 1 C on the other body?

180 years

220 years

200 years

120 years

Answer is:

200 years

Explanation:

Total charge transferred per second q=ne=10⁹?1.6?10^-19=1.6?10^-10C. So 1.6?10^-10C charge transferred in time=1second

37) If the wavelength of light falling on a surface is increased from 3000?A⁰?to 3040?A⁰, then what will be the corresponding change in the stopping potential (given that hc = 12.4?10⁷?eV?)?

(-7.5)??10^?12?V

(-8.5)??10^?12V

( -5.5) ?10^?12 V

(-6.5)??10^?12?V

Answer is:

( -5.5) ?10^?12 V

Explanation:

use W=hV_o and E = hc/(/lambda)

38) If the wavelength of light incident on photo-electric cell be reduced from 4000A⁰?to3600A⁰,then what will be the change in the cut off potential.

0.42Volt

0.43Volt

0.34Volt

0.30Volt

Answer is:

0.34Volt

Explanation:

use W=hV_o and E = hc/(/lambda)

Dual Nature of Radiation MCQ with Answers

For more MCQ's Click Here

34) Light of wavelength 4000?A0?is incident on a metal plate whose work function is 2 eV. The maximum kinetic energy of the emitted photoelectrons would be

1.1eV

Dual Nature of Radiation MCQ with Answers

Related Dual Nature of Radiation MCQ with Answers

35) Given h = 6.6??10?34?joule sec, the momentum of each photon in a given radiation is 3.3??10?29?kg metre/sec. The frequency of radiation is

1.5??1013?Hz

36) If?109?electrons move out of a body to another body every second, how much time is approximately required to get a total charge of 1 C on the other body?

200 years

37) If the wavelength of light falling on a surface is increased from 3000?A0?to 3040?A0, then what will be the corresponding change in the stopping potential (given that hc = 12.4?107?eV?)?

( -5.5) ?10?12 V

38) If the wavelength of light incident on photo-electric cell be reduced from 4000A0?to3600A0,then what will be the change in the cut off potential.

0.34Volt

Dual Nature of Radiation MCQ with Answers

34) Light of wavelength 4000?A⁰?is incident on a metal plate whose work function is 2 eV. The maximum kinetic energy of the emitted photoelectrons would be

35) Given h = 6.6??10^?34?joule sec, the momentum of each photon in a given radiation is 3.3??10^?29?kg metre/sec. The frequency of radiation is

1.5??10¹³?Hz

36) If?10⁹?electrons move out of a body to another body every second, how much time is approximately required to get a total charge of 1 C on the other body?

37) If the wavelength of light falling on a surface is increased from 3000?A⁰?to 3040?A⁰, then what will be the corresponding change in the stopping potential (given that hc = 12.4?10⁷?eV?)?

( -5.5) ?10^?12 V

38) If the wavelength of light incident on photo-electric cell be reduced from 4000A⁰?to3600A⁰,then what will be the change in the cut off potential.