Dual Nature of Matter and Radiation (NEST (National Entrance Screening Test) Physics): Questions 1 - 3 of 4

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Question number: 1

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

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.

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

d.

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

Question number: 2

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

Appeared in Year: 2008

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 3

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

Appeared in Year: 2008

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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