Which of the following principal quantum number values is impossible?

a. 2.5
b. 16
c. 3
d. 1


a

Physics & Space Science

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A beam of light of wavelength 674 nm is incident along the normal to two closely spaced parallel glass plates. For what air gap separation between the plates will the transmitted beam be of maximum intensity? (1 nm = 10?9 m)

a. 169 nm b. 674 nm c. 337 nm d. 843 nm e. 506 nm

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Why do gamma ray telescopes have poor angular resolution?

What will be an ideal response?

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A teaspoonful of neutron star material on Earth would weigh

A) about the same as a teaspoonful of Earth-like material. B) a few tons. C) more than Mt. Everest. D) more than the Moon. E) more than Earth.

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The ancient water erosion features on the surface of Mars suggest that the planet must have had a much

A) warmer, thinner atmosphere in the past B) cooler, thicker atmosphere in the past C) cooler, thinner atmosphere in the past D) warmer, thicker atmosphere in the past

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