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Exam 4: Audio Physics

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Question 1

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5W referenced to 1mW is equal to _______ decibels.

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Question 2

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The inverse square law:  states that by decreasing the distance to the source by half, will increase the sound intensity by 6db.

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The inverse square law:  states that the measured level of signal intensity will decrease by 3 dB for every doubling of distance from the source.

The signal attenuation for a coaxial cable transmitting 1MHz is listed as 1.3dB per 100m. How much loss will be seen at 700m?

The frequency response of an audio amplifier will typically be _________.

A sound level meter measures the sound pressure level of a source.

What type of generator generates equal intensities of all frequencies in the range of 20 to 20,000 Hz?

150Hz represents the lower frequency range, 8KHz represents the upper frequency range. Calculate the bandwidth of the device.

Coherence represents a(n) _________ relationship between two signals.

The velocity of sound in air is equal to 1,130ft/s. Calculate the wavelength of a 2KHz signal.

A doubling of acoustic power produces _________.

Calculate the 5^th harmonic of a 200Hz tone.

Calculate the power gain, in decibels, when increasing from 100W to 400W.

A signal source measures 90dB at 1m. Calculate the decibel loss at 7m.

The inverse square law:  states that all radiation patterns will decrease by the square of the distance.

For question #24, calculate the signal level, in decibels, at 7m.

The inverse square law:  will work of only sound waves.

The Potential Acoustic Gain Formula states that as the listeners double their distance from the sound source, the sound pressure level they perceive will decrease by 6dB.

A sound wave cannot exist at various different frequencies.

Low frequencies are direct line of sight.