Please solve these problems and show steps. Thanks! 5. You are driving a car tha

Question

Please solve these problems and show steps. Thanks!

5. You are driving a car that goes away from a noise source that has a frequency of 330Hz. The speed of sound is 330 m/s. If you drive with 30m/s the frequency of the sound you hear is (in Hz). A. 280 B. 290 C. 300 D. 310 E. 320 6. You are driving a car that goes towards a noise source that has a frequency of 3 30Hz. The speed of sound is 330 m/s. If you drive with 30m/s the frequency of the sound you hear is (in Hz) A. 300 B. 302.5 C. 330 D. 360 E. 363 7. You are conducting an experiment to identify the resonance in a string and you measure an average distance of 20 cm between two consecutive antinodes for a frequency of 400 Hz. The speed of the wave in the string is (in m/s) A. 100 D. 400 B. 160 E. 1600 C. 200

Explanation / Answer

f' = fo*(V-Vo)/V

f' = (330*(330-30))/330 = 300 Hz

option C

++++++++++++

f' = fo*(V+Vo)/V

f' = (330*(330+30))/330 = 360 Hz

option D

+++++++++

wavelength /2 = 20 cm

wavelength = 40 cm = 0.4 m

v = wavelength *f = 0.4*400 = 160 m/s

option B

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