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Acoustics
A musical tone sounded on a piano has a frequency of 261.6 Hz and a wavelength of 1.31 m. What is the speed of the sound wave?
Acoustics
The average sound intensity inside a busy restaurant is 4.9 x 10-5 W/m2. How much energy goes into each ear (area = 1.9 x 10-3 m2) during a one-hour meal?
Acoustics
What is the frequency of the note emitted by a disc siren with 30 holes, which is rotated at 500 revolutions per minute?!
Acoustics
q) In order to hear the echo of a sound, the minimum distance between the listener and the obstacle must be??( v of air is 332)
a.33m
b.17m
c.9.5m
d.8.5m
a.33m
b.17m
c.9.5m
d.8.5m
Acoustics
A friend claims that, "The sound level of a drill is 90 dB and it doesn't bother me. A rocket launch has a sound level of 180 dB and is considered very dangerous. How can this be, when it is only twice as loud?" Discuss the validity of your friend's statement.
Acoustics
If a sound pressure is measured at 2Nm^-2, calculate this in dB(SPL)
Acoustics
The diagram below shows three basic wave forms – a sine wave, a sawtooth wave and a square wave. On the right hand side of the diagram sketch the line spectrum for each wave type. You only need to show approximate amplitudes for harmonics – but give an indication of the harmonics you would expect to see and their relative amplitudes. Also label the harmonics you show using the normal convention of ‘f ‘ as the fundamental and 2f, 3f, 4f etc. labelling the harmonics that would be present.
Acoustics
The diagram below shows the first mode of vibration of a string that is fixed at both ends, such as a guitar string. On the lines provided add curves to the diagram representing the 2nd and 3rd modes of vibration and label one displacement node and one antinode in one of these modes.
Acoustics
Resp sir/mam,
My name is Tanvir and i am from India. I have a confusion in my mind.
as we all know when an object e.g. aeroplane etc crosses the sound barrier they produces a sonic boom. So sir my question is why is that sound barrier produced and will same or different type of thing will also be produced when an object crosses the speed of light.
Thanking you
My name is Tanvir and i am from India. I have a confusion in my mind.
as we all know when an object e.g. aeroplane etc crosses the sound barrier they produces a sonic boom. So sir my question is why is that sound barrier produced and will same or different type of thing will also be produced when an object crosses the speed of light.
Thanking you
Acoustics
an object vibrates 61440 times in a minute. if the velocity of the sound in the air is 330m/s. find the frequency of the sound in hertz and the wave length
