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Acoustics
Two sound waves are travelling through a room filled with Helium gas. Wave A has a wavelength of 1.2m. Wave B has a wavelength of 3.6m. Describe the velocity and frequency of wave A compared to wave B.
Acoustics
Two pure sine waves of 240Hz and 242Hz are played simultaneously through a loudspeaker. Describe what you would hear and why?
Acoustics
A sine wave sweep is played through a speaker in a large room. An SPL meter shows a significant rise in the level of the sine wave at 43Hz, 86Hz and 129Hz. Assuming that this is caused by standing waves between one set of parallel walls, calculate the distance between the walls.
From the information given above state the next frequency that is likely to cause a rise in level of the meter. What will the wavelength of this frequency be?
From the information given above state the next frequency that is likely to cause a rise in level of the meter. What will the wavelength of this frequency be?
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
A sine wave sweep is played through a speaker in a large room. An SPL meter shows a significant rise in the level of the sine wave at 43Hz, 86Hz and 129Hz. Assuming that this is caused by standing waves between one set of parallel walls, calculate the distance between the walls.
Acoustics
If six viola players in a string section each separately generate an SPL of
68dB then calculate the SPL when all six violas play together in unison.
68dB then calculate the SPL when all six violas play together in unison.
Acoustics
A rectangular room has rigid walls whose dimensions are L=4.5m width W=2.5m and the height 2.8m compute the first 20 of the normal mode frequencies .Vary l, m, and n to get these modes.
Acoustics
Given that the oboe's lowest note is B flat 3 and its length approximately 64 cm, what length would you expect for the bassoon, whose lowest note is B flat 1? What length for the contrabassoon, lowest note b flat 0?
Acoustics
The clarinet's lowest note is D3, 147 Hz. What is its effective length, that is, the length of an idealized closed pipe that has this frequency for its first mode? Explain why this is less than the actual length of the instrument?
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