Dual Nature of Matter and Radiation (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 4 - 6 of 16

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Question number: 4

» Dual Nature of Matter and Radiation » Photoelectric Effect

Appeared in Year: 2013

MCQ▾

Question

In a photocell circuit the stopping potential, V0, is a measure of the maximum kinetic energy of the photoelectrons. The following graph shows experimentally measured values of stopping potential versus frequency ν of incident light.

Graph of stopping potential verses frequency

Graph of Stopping Potential Verses Frequency

In figure graph of stopping potential verses frequency is shown.

The values of Plank’s constant and the work function as determined from the graph are (taking the magnitude of electronic charge to be e = 1.6 × 10– 19 C)

Choices

Choice (4) Response

a.

6.0×1034Js,3.2eV

b.

6.4×1034Js,2.0eV

c.

6.4×1034Js,3.2eV

d.

6.0×1034Js,2.5eV

Question number: 5

» Dual Nature of Matter and Radiation » De-Broglie Relation

Appeared in Year: 2013

MCQ▾

Question

Photons of energy 7 eV are incident on two metals A and B with work functions 6 eV and 3 eV respectively. The minimum de Broglie wavelengths of the emitted photoelectrons with maximum energies are λA and λB, respectively where λAλB is nearly,

Choices

Choice (4) Response

a.

4.0

b.

0.5

c.

2.0

d.

1.4

Question number: 6

» Dual Nature of Matter and Radiation » Photoelectric Effect

Appeared in Year: 2014

MCQ▾

Question

When ultraviolet radiation of a certain frequency falls on a potassium target, the photoelectrons released can be stopped completely by a retarding potential of 0.6 V. If the frequency of the radiation is increased by 10%, this stopping potential rises to 0.9 V. The work function of potassium is

Choices

Choice (4) Response

a.

2.0 eV

b.

2.8 eV

c.

3.0 eV

d.

2.4 eV

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