Which of the following is not a physical quantity ?

Loudness

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Frequency

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Wavelength

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Waveform

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Solution

The correct option is D Waveform
Waveform is related to the shape of the wave of an instrument. Or it's usually a graphic representation of the shape of a wave that indicates its characteristics (such as frequency and amplitude). That's why it's not physical quantity.
Hence, option D is correct.

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