13. Why do the strings used for the lowest--frequency notes on a piano normally have wire wrapped around them?
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- 1. We know that a speaker that is 3m away from us is playing music at an intensity of 0.89W/m2 What is the power of this speaker? 2. Another speaker is playing at an intensity of 1.2W/m2 and a power of 2W. How far away is this speaker from us?Question 4 -LO3 (a) Given an amplifier circuit in Figure Q4(a) with a sinusoidal input signal Va=0.495 Vac, i calculate the total gain of the amplifier circuit given R=15 kn, R: = 25 kn, R=100kn, R = 80 k R=70 kn, and R. = 60 ka. ii. calculate the amplitude of the output signal. Gnd Figure Q4(a)ny Use fn 2L to find f8 by giving v=340 m/s, the length of string L = 0.5 m
- 2. Determine the tension in the string AC and the reaction at B if W = 30N 130 B3. Given a tuning fork of unknown frequency, how will you be able to determine its frequency using a resonance tube and another tuning fork of known frequency. List down the steps to be followed.37. How do sound waves travel in a liquid? (a) Always as a transverse wave (b) Always as a longitudinal wave. (c) The mode of wave propagation depends on the bulk modulus (B) of the liquid.
- 18: A sonometer wire 60 cm long produces a resonance with a tuning fork. When its length is decreased by 5 cm, 10 beats are heard. Find the frequency of the tuning fork.3685 A 120 cm length of string is stretched between fixed supports. What are the (a) longest, (b) second longest, and (c) third longest wavelength for waves traveling on the string if standing waves are to be set up? (d) Sketch those standing waves.
- 13. The tension in a wire clamped at both ends is halved without appreciably changing the length of the wire between the clamps. What is the ratio of the new to the old wave speed for transverse waves traveling along the wire?2. While Dr. Benton was waiting at a stop light the other day, a car pulled up next to him emitting low frequency periodic thumping sounds out from the subwoofers of its stereo system at an intensity that he estimated to be 100 dB. If the car was 5 m away, how intense was the music for the people in the car sitting 1 m away from the speakers?1)