Photoelectric Effect
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357648 A metallic surface is illuminated with radiation of wavelength \(\lambda\), the stopping potential is \(V_{0}\). If the same surface is illuminated with radiation of wavelength \(2 \lambda\), the stopping potential becomes \(\dfrac{V_{0}}{4}\). The threshold wavelength for this metallic surface will be

1 \(\dfrac{3}{2} \lambda\)
2 \(4 \lambda\)
3 \(\dfrac{\lambda}{4}\)
4 \(3 \lambda\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357649 In an experiment to study photo-electric effect the observed variation of stopping potential with frequency of incident radiation is as shown in the figure. The slope and \(y\)-intercept are respectively
supporting img

1 \(\dfrac{h v}{e},-\dfrac{h}{e}\)
2 \(h v,-h v_{0}\)
3 \(\dfrac{h}{e},-\dfrac{h v_{0}}{e}\)
4 \(\dfrac{h v}{e}, v_{0}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357650 The stopping potential as a function of frequency of incident radiation is plotted for two different photo electric surfaces \(A\) and \(B\). The graphs show the work function of \(A\) is
supporting img

1 Greater than that of \(B\)
2 Smaller than that of \(B\)
3 Same as that of \(B\)
4 No comparision can be done from given graphs
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357651 Which of the following statement is not true about stopping potential \(\left(V_{0}\right)\) ?

1 It depends on the nature of emitter material.
2 It increases with increase in intensity of the incident light.
3 It depends upon frequency of the incident light.
4 It is \(1 / e\) times the maximum kinetic energy of electrons emitted.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357652 Assertion :
If work function of a material increases by some mechanism, it requires greater energy to excite the electrons from its surface.
Reason :
A plot of stopping potential \(\left(\mathrm{V}_{0}\right)\) versus frequency \((f)\) for different metals, has greater slope for metals with greater work functions.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357648 A metallic surface is illuminated with radiation of wavelength \(\lambda\), the stopping potential is \(V_{0}\). If the same surface is illuminated with radiation of wavelength \(2 \lambda\), the stopping potential becomes \(\dfrac{V_{0}}{4}\). The threshold wavelength for this metallic surface will be

1 \(\dfrac{3}{2} \lambda\)
2 \(4 \lambda\)
3 \(\dfrac{\lambda}{4}\)
4 \(3 \lambda\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357649 In an experiment to study photo-electric effect the observed variation of stopping potential with frequency of incident radiation is as shown in the figure. The slope and \(y\)-intercept are respectively
supporting img

1 \(\dfrac{h v}{e},-\dfrac{h}{e}\)
2 \(h v,-h v_{0}\)
3 \(\dfrac{h}{e},-\dfrac{h v_{0}}{e}\)
4 \(\dfrac{h v}{e}, v_{0}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357650 The stopping potential as a function of frequency of incident radiation is plotted for two different photo electric surfaces \(A\) and \(B\). The graphs show the work function of \(A\) is
supporting img

1 Greater than that of \(B\)
2 Smaller than that of \(B\)
3 Same as that of \(B\)
4 No comparision can be done from given graphs
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357651 Which of the following statement is not true about stopping potential \(\left(V_{0}\right)\) ?

1 It depends on the nature of emitter material.
2 It increases with increase in intensity of the incident light.
3 It depends upon frequency of the incident light.
4 It is \(1 / e\) times the maximum kinetic energy of electrons emitted.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357652 Assertion :
If work function of a material increases by some mechanism, it requires greater energy to excite the electrons from its surface.
Reason :
A plot of stopping potential \(\left(\mathrm{V}_{0}\right)\) versus frequency \((f)\) for different metals, has greater slope for metals with greater work functions.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357648 A metallic surface is illuminated with radiation of wavelength \(\lambda\), the stopping potential is \(V_{0}\). If the same surface is illuminated with radiation of wavelength \(2 \lambda\), the stopping potential becomes \(\dfrac{V_{0}}{4}\). The threshold wavelength for this metallic surface will be

1 \(\dfrac{3}{2} \lambda\)
2 \(4 \lambda\)
3 \(\dfrac{\lambda}{4}\)
4 \(3 \lambda\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357649 In an experiment to study photo-electric effect the observed variation of stopping potential with frequency of incident radiation is as shown in the figure. The slope and \(y\)-intercept are respectively
supporting img

1 \(\dfrac{h v}{e},-\dfrac{h}{e}\)
2 \(h v,-h v_{0}\)
3 \(\dfrac{h}{e},-\dfrac{h v_{0}}{e}\)
4 \(\dfrac{h v}{e}, v_{0}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357650 The stopping potential as a function of frequency of incident radiation is plotted for two different photo electric surfaces \(A\) and \(B\). The graphs show the work function of \(A\) is
supporting img

1 Greater than that of \(B\)
2 Smaller than that of \(B\)
3 Same as that of \(B\)
4 No comparision can be done from given graphs
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357651 Which of the following statement is not true about stopping potential \(\left(V_{0}\right)\) ?

1 It depends on the nature of emitter material.
2 It increases with increase in intensity of the incident light.
3 It depends upon frequency of the incident light.
4 It is \(1 / e\) times the maximum kinetic energy of electrons emitted.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357652 Assertion :
If work function of a material increases by some mechanism, it requires greater energy to excite the electrons from its surface.
Reason :
A plot of stopping potential \(\left(\mathrm{V}_{0}\right)\) versus frequency \((f)\) for different metals, has greater slope for metals with greater work functions.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357648 A metallic surface is illuminated with radiation of wavelength \(\lambda\), the stopping potential is \(V_{0}\). If the same surface is illuminated with radiation of wavelength \(2 \lambda\), the stopping potential becomes \(\dfrac{V_{0}}{4}\). The threshold wavelength for this metallic surface will be

1 \(\dfrac{3}{2} \lambda\)
2 \(4 \lambda\)
3 \(\dfrac{\lambda}{4}\)
4 \(3 \lambda\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357649 In an experiment to study photo-electric effect the observed variation of stopping potential with frequency of incident radiation is as shown in the figure. The slope and \(y\)-intercept are respectively
supporting img

1 \(\dfrac{h v}{e},-\dfrac{h}{e}\)
2 \(h v,-h v_{0}\)
3 \(\dfrac{h}{e},-\dfrac{h v_{0}}{e}\)
4 \(\dfrac{h v}{e}, v_{0}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357650 The stopping potential as a function of frequency of incident radiation is plotted for two different photo electric surfaces \(A\) and \(B\). The graphs show the work function of \(A\) is
supporting img

1 Greater than that of \(B\)
2 Smaller than that of \(B\)
3 Same as that of \(B\)
4 No comparision can be done from given graphs
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357651 Which of the following statement is not true about stopping potential \(\left(V_{0}\right)\) ?

1 It depends on the nature of emitter material.
2 It increases with increase in intensity of the incident light.
3 It depends upon frequency of the incident light.
4 It is \(1 / e\) times the maximum kinetic energy of electrons emitted.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357652 Assertion :
If work function of a material increases by some mechanism, it requires greater energy to excite the electrons from its surface.
Reason :
A plot of stopping potential \(\left(\mathrm{V}_{0}\right)\) versus frequency \((f)\) for different metals, has greater slope for metals with greater work functions.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357648 A metallic surface is illuminated with radiation of wavelength \(\lambda\), the stopping potential is \(V_{0}\). If the same surface is illuminated with radiation of wavelength \(2 \lambda\), the stopping potential becomes \(\dfrac{V_{0}}{4}\). The threshold wavelength for this metallic surface will be

1 \(\dfrac{3}{2} \lambda\)
2 \(4 \lambda\)
3 \(\dfrac{\lambda}{4}\)
4 \(3 \lambda\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357649 In an experiment to study photo-electric effect the observed variation of stopping potential with frequency of incident radiation is as shown in the figure. The slope and \(y\)-intercept are respectively
supporting img

1 \(\dfrac{h v}{e},-\dfrac{h}{e}\)
2 \(h v,-h v_{0}\)
3 \(\dfrac{h}{e},-\dfrac{h v_{0}}{e}\)
4 \(\dfrac{h v}{e}, v_{0}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357650 The stopping potential as a function of frequency of incident radiation is plotted for two different photo electric surfaces \(A\) and \(B\). The graphs show the work function of \(A\) is
supporting img

1 Greater than that of \(B\)
2 Smaller than that of \(B\)
3 Same as that of \(B\)
4 No comparision can be done from given graphs
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357651 Which of the following statement is not true about stopping potential \(\left(V_{0}\right)\) ?

1 It depends on the nature of emitter material.
2 It increases with increase in intensity of the incident light.
3 It depends upon frequency of the incident light.
4 It is \(1 / e\) times the maximum kinetic energy of electrons emitted.
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357652 Assertion :
If work function of a material increases by some mechanism, it requires greater energy to excite the electrons from its surface.
Reason :
A plot of stopping potential \(\left(\mathrm{V}_{0}\right)\) versus frequency \((f)\) for different metals, has greater slope for metals with greater work functions.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.