Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 86

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Weekly Quiz Competition

Question 1
4 / -1

The work functions of metals A and B are in the ratio 1: 2. If light of frequencies f and 2f are incident on the surface of A and B respectively, the ratio of the maximum kinetic energies of photo electrons emitted is (f is greater than threshold frequency of A, 2f is greater than threshold frequency of B)

A
1 : 1

B
1 : 2

C
1 : 3

D
1 : 4

Solution
Question 2
4 / -1

A photo-cell employs photoelectric effect of convert

A
Change in the intensity of illumination into a change in the work function of the photo cathode

B
Change in the frequency of light into a change in the electric current

C
Change in the frequency of light into a change in electric voltage

D
Change in the intensity of illumination into a change in photoelectric current
Question 3
4 / -1

4 eV is the energy of the incident photon and the work function is 2 eV. What is the stopping potential?

A
2V

B
4V

C
6V

D
2√2 V

Solution
Question 4
4 / -1

Light of frequency v is incident on a certain photoelectric substance with threshold frequency v_o. The work function for the substance is

A
hv

B
hv₀

C
h (v – v₀)

D
h(v + v₀)
Question 5
4 / -1

The incident photon involved in the photoelectric effect experiment

A
Completely disappears

B
Comes out with an increased frequency

C
Comes out with a decreased frequency

D
Comes out without change in frequency
Question 6
4 / -1

The light rays having photons of energy of 1.8 eV are falling on a metal surface having a work function 1.2 eV. What is the stopping potential to be applied to stop the emitting electrons?

A
3 eV

B
1.2 eV

C
0.6 eV

D
1.4 eV

Solution
Question 7
4 / -1

The photoelectric threshold wavelength for potassium(work function being 2 eV) is

A
310 nm

B
620 nm

C
1200 nm

D
2100 nm

Solution
Question 8
4 / -1

For photoelectric emission, tungsten requires light of 2300 Å. If light of 1800 Å wavelength is incident then emission

A
Takes place

B
Doesn't take place

C
May or may not take place

D
Depends on frequency
Question 9
4 / -1

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively, successively illuminates a metal of work function 0.5 eV. The ratio of maximum kinetic energy of the emitted electron will be

A
1 : 5

B
1 : 4

C
1 ; 2

D
1 : 1

Solution
Question 10
4 / -1

Photon of 5.5 eV energy falls on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0 eV. The stopping voltage required for these electrons are

A
5.5 V

B
1.5 V

C
9.5 V

D
4.0 V

Solution