A airplane approaches at an altitude of 10 km flying at 600 km/hr.   1.  If the air temperature on average is -10 °C, what is the speed of sound in air? 2.  If the plane will be overhead in 1 minute, when will we hear it coming? 3.  Assuming the plane emits a frequency of 2000 Hz from its engines, what frequency do we hear initially when it is 1 minute away, and what frequency do we hear 1 minute after it has passed by?

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A: The addition of sound intensity in decibel follows the relation; Itotal=10log10∑i=1n10Ii10

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Q: e of wave is a sound wave?

A: Solution

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Q: frequency?

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.