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Acoustics
find the ratio of length of a closed organ pipe to that of a open pipe in order that the 2nd overtone of the former is in unison with 4th overtone of the latter
Acoustics
Consider two cylindrical pipes of equal length. One of these acts as a closed organ pipe
and the other as open organ pipe. The frequency of the second harmonic in the closed
pipe is 200 Hz higher than the first harmonic of the open pipe. Calculate the fundamental
frequency of the closed pipe.
and the other as open organ pipe. The frequency of the second harmonic in the closed
pipe is 200 Hz higher than the first harmonic of the open pipe. Calculate the fundamental
frequency of the closed pipe.
Acoustics
A stretched string of mass 20 g vibrates with a frequency of 30 Hz in its fundamental
mode and the supports are 40 cm apart. The amplitude of vibrations at the antinode is
4 cm. Calculate the velocity of propagation of the wave in the string as well as the tension
in it.
mode and the supports are 40 cm apart. The amplitude of vibrations at the antinode is
4 cm. Calculate the velocity of propagation of the wave in the string as well as the tension
in it.
Acoustics
Given the following values: Frequency = 6MHz, PRF = 1 kHz, 2 cycles per pulse, Spatial Average Temporal Intensity = 4 watts per centimeter squared
What is the spatial average temporal intensity at the surface? What is it at 3 cm depth? What is it at 6 cm depth?
What is the spatial average temporal intensity at the surface? What is it at 3 cm depth? What is it at 6 cm depth?
Acoustics
20 dB-Hz bandwidth corresponds to 1000 Hz
Acoustics
A bat flying in a cave emits a sound and
receives its echo 0.2 s later.
How far away is the cave wall? Assume the
speed of sound to be 340 m/s.
Answer in units of m
receives its echo 0.2 s later.
How far away is the cave wall? Assume the
speed of sound to be 340 m/s.
Answer in units of m
Acoustics
a source produces 400 waves every minute. if the speed of the waves is 8mm/s calculate the distance between adjacent troughs
Acoustics
when the outdoor emergency warning siren at Cheryl's school was tested, the sound from the siren took 7,0 seconds to reach her house located 2400 miles from tohe school. What is the speed of sound in air?
Acoustics
Coat one half of the inside of a jar with a layer of soot and drill a hole in its cover.
When light from a light bulb connected to AC hits the jar’s black wall, a
distinct sound can be heard.
why ???
When light from a light bulb connected to AC hits the jar’s black wall, a
distinct sound can be heard.
why ???
Acoustics
Bats chirp at high frequencies humans cannot hear. They use the echos to detect small objects, such as insects, as small as one wavelength. If a bat emits a chirp at a frequency of 60.0 kHz and the speed of of sound waves in the air is 340 m/s, what is the size in millimeters of the smallest insect the bat can detect.
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