For a particular tube, among six harmoni...

For a particular tube, among six harmonic frequencies below 1000 Hz, only four harmonic frequencies are given: 300 Hz, 600 Hz, 750 Hz and 900 Hz. What are the two other frequencies missing from this list?

100 Hz, 150 Hz

150 Hz, 450 Hz

450 Hz, 700 Hz

700 Hz, 800 Hz

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The correct Answer is:

Fundamental frequency `f_(0)=150 Hz`
From the series of frequencies we get
`f_(1)=2f_(0)`
`f_(2)3f_(0)=3xx150=450 Hz`

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