Question

the sound produced by a jet plane is of very high pitch because of high _______. (frequency /time period /amplitude/ wave velocity)

Answer 1

frequency is directly proportional to pitch
so answer is frequency

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Answer 2

SOUND

The sound produced by a jet plane is of very high pitch because of high frequency.

Pitch : Pitch is the characteristic of sound by which a shrill note can be distinguished from a grave or a flat note. It depends on the frequency of sound. pitch cannot be quantified.

If frequency  is high , pitch will also high, if pitch is low , this means frequency is low.

For example, the pitch girls voice is more than  that of boy's voice.