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Objective Questions
GS
GS Set-1
Physics
Dual Nature of Radiation
32

Dual Nature of Radiation MCQ with Answers

32) The work function for aluminium surface is 4.2 eV. The cutoff wavelength for the photo electric effect for the surface is

3100?A⁰

2400?A⁰

1500?A⁰

2955?A⁰

Answer is:

2955?A⁰

Explanation:

use W=hV_o

Dual Nature of Radiation MCQ with Answers

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33) The work function of a photoelectric material is 3.32 eV. The threshold frequency will be equal to

9??10¹⁴?HZ

6??10¹⁴?HZ

8??10¹⁴?HZ

7??10¹⁴?HZ

Answer is:

8??10¹⁴?HZ

Explanation:

use W=hV_o

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)

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

Dual Nature of Radiation MCQ with Answers

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32) The work function for aluminium surface is 4.2 eV. The cutoff wavelength for the photo electric effect for the surface is

2955?A0

Dual Nature of Radiation MCQ with Answers

Related Dual Nature of Radiation MCQ with Answers

33) The work function of a photoelectric material is 3.32 eV. The threshold frequency will be equal to

8??1014?HZ

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

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

Dual Nature of Radiation MCQ with Answers

2955?A⁰

8??10¹⁴?HZ

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?