Dual Nature of Matter and Radiation-Photoelectric Effect (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 4 - 7 of 9

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Question number: 4

» 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 (Et) and quantum number (n) of the resulting state are respectively,

Choices

Choice (4) Response
a.

Et=13.6eV,n=2

b.

Et=6.0eV,n=2

c.

Et=6.0eV,n=3

d.

Et=13.6eV,n=1

Question number: 5

» 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.

1020m2s1

b.

10m2s1

c.

1015m2s1

d.

1010m2s1

Question number: 6

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

Question

The wavelength of the first line of Balmer series is 6134 Å. The wavelength of the first line of Lyman series is –

Choices

Choice (4) Response
a.

3008 Å

b.

3607 Å

c.

2678 Å

d.

3408 Å

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

Choices

Choice (4) Response
a.

27128λ

b.

2569λ

c.

2253λ

d.

12827λ

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