a) we know the formula
intensity=P/4pir2=111W/4*pi*(10.7m)2=0.0772 W/m2
so the answer is 0.0772 W/m2 0.077 W/m2 or 0.08 W/m2
b) we have the formula
=10 log(I/Io)=10 log( 7.72*10-2/1*10-12)=109 dB
so the answer is 109 dB or 108.88 dB or 108.9 dB
c) we have the formula
at 120 dB I=1 W/m2
I=p/4pir2
r=P/4piI=111/4pi*1=2.97m
answer 11) a) we know the formula
fo=fs(v/v-vs)
while approaching the speed=42.1 m/s=vs
fo=330m/s(343m/sm/s/343-42.1m/s)=376.17 Hz
when receding speed vs=-42.1m/s
fo=330m/s/(343m/s/343m/s-(-42.1m/s)=293.92Hz
so frequency shift is =f receding-f approach=293.92-376.17=-82 Hz
so the answer is -82 Hz or -82.25 Hz or -82.3 Hz.
b) we know the formula
=v/f( approach)=343m/s/376=0.912m
so the answer 0.912m or 0.91 m
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111 w (a) Find the intensity 10.7 m from the source W/m2 (b) Find the intensity level in decibels at that distance. dB (c) At what distance would you experience the sound at the threshold of pain, 120 dB? Need Help? Read 11. -/2 points SerCP10 14 P023 My No A commuter train passes a passenger platform at a constant speed of 42.1 m/s. The...
A commuter train passes a passenger platform at a constant speed of 35.9 m/s. The train horn is sounded at its characteristic frequency of 340 Hz. (a) What overall change in frequency is detected by a person on the platform as the train moves from approaching to receding? (Indicate whether the frequency increases of decreases with the sign of your answer.) Incorrect: Your answer is incorrect. Your response differs from the correct answer by more than 100%. Hz (b) What...
QUESTION The power output of a sound system is increased by a factor of 25. By what factor should you adjust your distance from the speakers so the sound intensity is the same? . PRACTICE IT .............. Use the worked example above to help you solve this problem. A small source emits sound waves with a power output of 81.3 W. (a) Find the intensity 3.08 m from the source. . 75X Your response is within 10% of the correct...
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