Dual Nature of Matter and Radiation [NEST (National Entrance Screening Test) Physics]: Questions 1 - 4 of 4

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Question number: 1

» Dual Nature of Matter and Radiation » Particle Nature of Light

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Appeared in Year: 2007

MCQ▾

Question

Electrons cannot remain confined in a nucleus. This is because –

Choices

Choice (4)Response

a.

Pauli’s exclusion principle forbids electrons to be bound together in the same nucleus.

b.

Electrons confined in a nucleus will, according to the uncertainty principle, have so much kinetic energy that even electron – proton attraction will not be able to hold them bound.

c.

The size of an electron is about , which is much bigger than the typical size of a nucleus .

d.

Electron – electron repulsion will dominate electron – proton attraction inside the nucleus.

Question number: 2

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

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Appeared in Year: 2008

MCQ▾

Question

A free particle with initial kinetic energy and de Broglie wavelength enters a region in which it has potential energy . The particle’s new de Broglie wavelength is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 3

» Dual Nature of Matter and Radiation » Black-Body Radiation

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Appeared in Year: 2008

MCQ▾

Question

The intensity of solar radiation received by the Earth is . Assuming the Earth to be a perfect spherical blackbody, its equilibrium temperature is nearly –

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 4

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

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Appeared in Year: 2014

MCQ▾

Question

A free particle with initial kinetic energy and de Broglie wavelength enters a region of constant potential energy such that the new de Broglie wavelength is now . Then is –

Choices

Choice (4)Response

a.

b.

c.

d.

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