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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?

A

100 Hz, 150 Hz

B

150 Hz, 450 Hz

C

450 Hz, 700 Hz

D

700 Hz, 800 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
150 Hz , 450 Hz
If the tube is open at both ends so the harmonic frequencies are based on 150 Hz.
`1^(st) = 150 , 2^(nd) = 300 Hz , 3^(rd) = 450 Hz , 4^(th) = 600 Hz , 5^(th) = 750 Hz , 6^(th) = 900 Hz`
The above frequencies the missing frequency in the list 150 Hz, 450 Hz
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