Ch 6: Problem Set (in progress) Flashcards

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1
Q

find the other item.

A
  • 2.76 Hz = 0.36 sec
  • 11.8 sec = 0.085 Hz
  • 0.436 kHz = 2.29 x 10-3 sec
  • 5/8 sec = 8/5 Hz
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2
Q

what are the frequency and velocity of a wave where wavelength = 0.787 m and period = 2.65 sec?

A

frequency = 0.3773 Hz

and

velocity = 0.297 m/s a.f.s.

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3
Q

what are the wavelength and period of a wave moving at 376 cm/s a.f.s. @ 808 cHz?

A

frequency = 0.124 sec

wavelength = 46.5 cm

(note: photo should read T = 1/8.08 = 0.124

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4
Q

if a sound is 4.8 x 10-9 W/m2 at 15.2 m from a source, what is the intensity at 36.4 m from the source?

A

8.352 x 10-10 W/m2

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5
Q

if a sound is 2.06 x 10-11 W/m2 at 66.3 m from the source, what is the intensity at 19.7 m?

A

2.34 x 10-11 W/m2

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6
Q

if a sound is 5.11 x 10-7 W/m2 at 31.3 m from the source, at what distance is it 2.48 x 10-6 W/m2 ?

A

14.2 m

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7
Q
A

(5 cycles)

wavelength = 0.09 m

T = 0.0027 sec

F = 370 Hz

v = 33.3 m/s a.f.s.

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8
Q
A

(5.5 cycles)

wavelength = 0.8 cm

T = 0.02 sec

F = 50 Hz

v = 40 cm/s a.f.s.

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9
Q
A

(4 cycles)

wavelength = 2.27 km

T = 6.83 sec

F = 0.15 Hz

v = 0.332 km/s a.f.s.

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