# Dual Nature of Matter and Radiation (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 4 - 6 of 19

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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.

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.

b.

c.

d.

## 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 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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