# Dual Nature of Matter and Radiation (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 7 - 10 of 19

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## Question number: 7

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

### Question

If the wavelength of photon emitted due to transition of electron from fourth orbit to second orbit in a hydrogen atom is λ, then the wavelength of photon emitted due to transition of electron from fifth orbit to third orbit will be –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 8

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

MCQ▾

### Question

A stream of photons having energy 5 eV each impinges on a Lithium surface. The work function of Lithium is 2.9 eV. The emerging photo-electrons are slowed down by copper plate placed 3 mm away. If the potential difference between two metal plates is 1 V, the maximum distance the electrons can move away from the Lithium surface before being turned back is –

### Choices

Choice (4) Response

a.

6.3 mm

b.

7.8 mm

c.

5.5 mm

d.

7.0 mm

## Question number: 9

» Dual Nature of Matter and Radiation » Photoelectric Effect

Appeared in Year: 2013

MCQ▾

### Question

A singly ionized helium atom in an excited state (n = 4) emits a photon of energy 2.6 eV. Given that the ground state energy of hydrogen atom is -13.6 eV, the energy and quantum number (n) of the resulting state are respectively,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 10

» Dual Nature of Matter and Radiation » Photoelectric Effect

Appeared in Year: 2015

MCQ▾

### Question

A 160 watt infrared source is radiating light of wavelength 50000 Å uniformly in all directions. The photon flux at a distance of 1.8m is of the order of,

### Choices

Choice (4) Response

a.

b.

c.

d.

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