7.Two notes are played by two violinist. One note is played at 440 Hz, while the

Question

7.Two notes are played by two violinist. One note is played at 440 Hz, while the other is played at 436 Hz. An observer will hear a note at (a) 438 Hz with a beat frequency of 2 Haz. (b) 438 Hz with a beat frequency of 4 H (c) 2 Hz with a beat frequency of 438 Hz (d) 4 Hz with a beat frequency of 438 Hz. 8.What property of waves creates the Doppler effect? (a) Waves diffract when moving through small opening (b) Waves refract when changing mediums (c) Wavelength is independent of wave amplitude. (d) Wave velocity is independent of the wave source. 9. The mass m is suspended to a spring of length 1 and force constant k. The frequeney of vibration is f. The spring cut into two equal parts and each half is loaded with the same mass m. The new frequency f is given by: (b) fy (d) f2m (c) fa-lfi 10.The speed of sound in air is 420 ma-. The sound from a jet moving through air at 100 ms-1 will move at (a) 240 ms (c) 440 m1 11. Which of the following in the observed frequency of sound? (a)The source moves away from the observer at 33 ms.-1 (b) The observer moves toward the source at 33 ms (c) The source moves toward the observer at 33 us.-I b) 420 ms (d) 34,000 m- will result in the greatest increase

Explanation / Answer

Q7 -- an ibserver will hear a frequncy of 438 hz with a beat frequency of (440-436) = 2 hz . Option b

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