Question

Which of the following is true ?

A. The stopping potential increases with increasing intensity of incident light
B. The photocurrent increases with increasing intensity of light  
C. The current in photocell increases with increasing frequency of light
D. The photocurrent is proportional to applied voltage
Answer :   The photocurrent increases with increasing intensity of light
Solution :
(A) Stopping potential is the negative potential applied to stop the photoelectrons from the metal. Stopping potential is given by $$e{V_0} = {K_{\max }}$$
Since, maximum kinetic energy of photoelectrons does not depend on intensity of light, so stopping potential does not vary with intensity of light. Thus, choice (A) is not correct.
(B) If intensity of incident light is increased, we can say that the number of photons incident per unit area per unit time will be increased. Therefore, more electrons will be emitted per second. Hence, photo-current increases. Thus, choice (B) is correct.
(C) The photo-current does not depend on frequency of light. Thus, choice (C) is not correct.
(D) The photo-current does not depend on applied voltage. Thus, choice (D) is not correct.

Releted MCQ Question on
Modern Physics >> Dual Nature of Matter and Radiation

Releted Question 1

A particle of mass $$M$$ at rest decays into two particles of masses $${m_1}$$ and $${m_2},$$ having non-zero velocities. The ratio of the de Broglie wavelengths of the particles, $$\frac{{{\lambda _1}}}{{{\lambda _2}}},$$  is

A. $$\frac{{{m_1}}}{{{m_2}}}$$
B. $$\frac{{{m_2}}}{{{m_1}}}$$
C. 1.0
D. $$\frac{{\sqrt {{m_2}} }}{{\sqrt {{m_1}} }}$$
View Answer
Releted Question 2

A proton has kinetic energy $$E = 100\,keV$$   which is equal to that of a photon. The wavelength of photon is $${\lambda _2}$$ and that of proton is $${\lambda _1}.$$ The ration of $$\frac{{{\lambda _2}}}{{{\lambda _1}}}$$  is proportional to

A. $${E^2}$$
B. $${E^{\frac{1}{2}}}$$
C. $${E^{ - 1}}$$
D. $${E^{ - \frac{1}{2}}}$$
View Answer
Releted Question 3

A beam of electron is used in an YDSE experiment. The slit width is $$d.$$ When the velocity of electron is increased, then

A. no interference is observed
B. fringe width increases
C. fringe width decreases
D. fringe width remains same
View Answer
Releted Question 4

Formation of covalent bonds in compounds exhibits

A. wave nature of electron
B. particle nature of electron
C. both wave and particle nature of electron
D. none of these
View Answer

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Dual Nature of Matter and Radiation

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