I need help with these homework problems
1. The amplitude of the wave shown in the figure is
A. A.
B. B.
C. C.
D. D.
2. The wavelength of the wave shown in the figure is
A. A.
B. B.
C. C.
D. D.
3. What is the wavelength of a wave with a speed of 9.0 m/s and a period of 0.33 s?
A. 0.33 m
B. 1.5 m
C. 3.0 m
D. 13 m
E. 27 m
4. A wave has a frequency of 58 Hz and a speed of 31 m/s. What is the wavelength of this wave?
A. 1.9 m
B. 3.5 m
C. 0.29 m
D. 0.53 m
E. 31 m
5. A stationary railroad whistle is sounded. An echo is heard 5.0 seconds later by the train’s engineer. If the
speed of sound is 343 m/s, how far away is the reflecting surface?
A. 68 m
B. 140 m
C. 860 m
D. 1700 m
E. 2000 m
6. Ocean waves with a period is 10 s are found to have a wavelength of 120 m. Their speed is
A. 0.083 m/s.
B. 12 m/s.
C. 120 m/s.
D. 1200 m/s.
E. None of the above is correct
7. The musical note A has a frequency of 440 Hz and its wavelength in seawater is 3.5 m. The speed of sound in
seawater is
A. 80 m/s.
B. 126 m/s.
C. 1540 m/s.
D. 3 108 m/s.
E. 343 m/s
8. Radio amateurs are permitted to communicate on the “10-meter band”. What frequency of radio waves
corresponds to a wavelength of 10 meters?
A. 3.3 10-8 Hz
B. 3.0 107 Hz
C. 3.3 107 Hz
D. 3.0 109 Hz
E. 3.0 106 Hz
