For a given wave if frequency doubles the wavelength
a doubles
b stays the same
c is halved
d quadruples

C is halved

Explanation:

The frequency and the wavelength of a wave are related by the equation:

where

v is the speed of the wave

f is the frequency

is the wavelength

From the equation above, we see that for a given wave, if the wave is travelling in the same medium (and so, its speed is not changing), then the frequency and the wavelength are inversely proportional to each other.

Therefore, if the frequency doubles, the wavelength will halve in order to keep the speed constant:

d) physical means can be used to separate the components of air.

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