1. Two waves with slightly different frequencies overlap, resulting in a beat pa

Question

1. Two waves with slightly different frequencies overlap, resulting in a beat pattern. What type of interference is present? A. Constructive B. Destructive C. Both A and B (changing with time) D. None of the above 2. The human perception of loudness is most closely associated with? A. frequency B. wavelength C. amplitude D. wave speed 3. What is the name given to the process by which complex waves can be explained as combinations of pure sine waves? A. Diffraction B. Interference C. Superposition D. Fourier transform 4. Two Bats are flying at night in the cool air. The bat on the left is emitting 27,000 Hz chirps. The bat on the left is flying at 2 m/s to the right and the right side bat is flying at 4 m/s to the right. A. The right side bat will hear a higher frequency than the emitted source. B. The right side bat will hear a lower frequency than the emitted source. C. The right side bat will hear the same frequency as the emitted source D. Impossible to determine. 5. Typically waves in liquids will be A. Longitudinal and slower than those in solids B. Transverse and slower than those in solids C. Longitudinal and faster than those in solids D. Transverse and faster than those in solids 6. A music tech major has just played a song at 56 dB; if she now wants to play the song so that it sounds 4 times louder, at what sound intensity level should she play it? A. 60 dB B. 66 dB C. 76 dB D. 224 dB E. None of the above

Explanation / Answer

1) (C)

2) (A)

3) (D)

4) (D)

Here the Source s is approaching the observer o and observer o moving away from it.

So, f' = [(v-vo)/(v-vs)] f

Hence it is not possible to say.

5) (B)

6) (A)

B = 10 log (I/10^-12)

=> I = antilog(B/10) x 10^-12

= antilog(56/10) x 10^-12

= 3.981 x 10^-7

Now, I' = 4 x 3.981 x 10^-7

So, B' = 10 log (I'/10^-12)

= 62

Nearest is option A 60 dB

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