Choose the correct statement

a. The perceived pitch of a sound usually doesn't depend on the sound's frequency.
b. The frequency of each musical note is 10 Hz higher than that of the next lower note.
c. The decibel is the standard measure of tone quality.
d. The perceived loudness of a sound depends somewhat on frequency.

d

Physics & Space Science

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The electric field 1.5 cm from a very small charged object points toward the object with a magnitude of 180,000 N/C. What is the charge on the object? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)

A) +4.5 nC B) -5.0 nC C) +5.0 nC D) -4.5 nC

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Physics & Space Science

Suppose Sammy Sosa hits a home run which travels 361. ft (110. m). Leaving the bat at 50 degrees above the horizontal, how high did it travel?

What will be an ideal response?

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Physics & Space Science

Which of the following statements is most correct about the uncertainty principle?

A. It is impossible to know exactly both the position and the momentum of a particle simultaneously. B. An electron with some momentum can be trapped into an arbitrarily small box. C. Our instruments will eventually be able to measure more precisely than the principle presently allows. D. On large length scales, the uncertainty principle dominates our understanding of the physical world. E. A particle limited in space can occupy any energy.

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Physics & Space Science

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