41. If you run towards the source, the frequen than f c. lower than hear is a. t

Question

41. If you run towards the source, the frequen than f c. lower than hear is a. the same as f b. higher d. unrelated to f much louder does a 100 dB sound appear relative to a 50 dB sound? a. 5 times. b. 25 times c. 10 times d. 32 times 43. Why does the same note sound different when a. speed of sound is different b. different pitches c. loudnesses are different d. harmonics are played on a flute vs a violin? different. Radio waves travel at 300,000,000 m/s. What is the wavelength of radio waves received at 100.1 MHz on your FM dial? 44. a. 3m b. 3m c. 30 m d. 300 m e. 3000 m 45. If the frequency of a certain wave is 10 Hz, its s0 period is a. 0.1 seconds b. 10 seconds c. 100 seconds d. 0.01 seconds e. 1 second all 46. Sound travels faster in air if the air temperature is es, ou a. warm b. cold c. average ro. 7. The fundamental frequency of a violin string is 440 Hz. The frequency of its second harmonic is a 880 dz b. 220Hz c. 440 Hz A sound wave is a a. longitudinal wave b. transverse wav c. standing wave d. shock wave ck 48. the 30 mls

Explanation / Answer

41] b by dopplers formula

By dopplers formula we have, f' = f*(v+vo)/v

where v is speed of sound and vo is velocity of observer towards source, f is original frequency, f' is observed frequency.

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