# Solved >   11) Why does the intensity of waves:1178951 …

11) Why does the intensity of waves from a small source decrease with the square of the distance from the source?

A) The waves run out of energy as they travel.

B) The waves spread out as they travel.

C) The medium through which the waves travel absorbs the energy of the waves.

D) The waves slow down as they travel away from the source.

E) The frequency of the waves decreases as they get farther from the source.

12) When a guitar is tuned to adjust it pitch, what is it that is changed?

A) The wavelength of the fundamental.

B) The frequency of the fundamental.

C) The amplitude of the fundamental.

13) If a guitar string has a fundamental frequency of 500 Hz, which one of the following frequencies can set the string into resonant vibration?

A) 250 Hz

B) 750 Hz

C) 1500 Hz

D) 1750 Hz

14) A stretched string is observed to have four equal segments in a standing wave driven at a frequency of 480 Hz.  What driving frequency will set up a standing wave with five equal segments?

A) 600 Hz

B) 360 Hz

C) 240 Hz

D) 120 Hz

15) If a string fixed at both ends resonates in its fundamental mode with a frequency of 150 Hz, at which of the following frequencies will it not resonate? (There could be more than one correct choice.)

A) 75 Hz

B) 300 Hz

C) 450 Hz

D) 500 Hz

E) 600 Hz

16) A string fixed at both ends is vibrating in one of its harmonics. If we now increase only the frequency at which the string is vibrating, which of the following characteristics do we also increase? (There could be more than one correct choice.)

A) the speed of the traveling waves on the string

B) the period of the traveling waves on the string

C) the wavelength of the traveling waves on the string

D) the amplitude of the traveling waves on the string

E) none of the above

17) Seven seconds after a brilliant flash of lightning, thunder shakes the house. Approximately how far was the lightning strike from the house?

A) much closer than one kilometer

B) about one kilometer away

C) about two kilometers away

D) much farther away than two kilometers

E) It is impossible to say.

18) What characteristics of a sound wave are related to the “pitch” of a musical note? (There could be more than one correct choice.)

A) amplitude

B) wavelength

C) frequency

D) period

19) Sound A has a high pitch and sound B has a low pitch. Which of the following statements about these two sounds are correct? (There could be more than one correct choice.)

A) The wavelength of A is longer than the wavelength of B.

B) The period of A is shorter than the period of B.

C) The frequency of A is greater than the frequency of B.

D) Sound B travels faster than sound B through air.

E) The amplitude of A is larger than the amplitude of B.

20) You double your distance from a sound source that is radiating equally in all directions.  What happens to the intensity of the sound?  It reduces to

A) one-half its original value.

B) one-fourth its original value.

C) one-sixteenth its original value.

D) none of the above

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