What wavelength corresponds to the n = 2 ? n = 1 transition in singly-ionized helium?

A)

15.2 nm
B)

22.8 nm
C)

4.56 nm
D)

11.4 nm
E)

30.4 nm

E

Physics & Space Science

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Which of the following statements is not true about wave packets and their use in describing particles?

A. A wave packet is fundamentally a region over which a number of waves of different frequencies and amplitudes are added together to form a non-zero result. B. An important property of a wave packet describing a particle is the superposition of many different waves.

C. The particle can be described using Fourier series and a Fourier integral. D. The movement and travel of a wave packet is governed by their grouping order. E. An important property of a wave packet describing a particle is the localization of wave amplitude.

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Physics & Space Science

When a metal plate with a hole in it is cooled, the size of the hole becomes

1) smaller, 2) larger, 3) remains the same size, and when the plate is heated, the hole becomes 4) smaller. 5) larger. 6) remains the same size.

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Physics & Space Science

Heat flow occurs between two bodies in thermal contact when they differ in what property?

a. mass b. specific heat c. density d. temperature

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Instructions: On occasion, the notation will be a shorthand notation for .

Given that   and  , what is ? ? A.


B.

C.

D.

E.

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Physics & Space Science