It is possible to hear beats from the two vibrating sources of frequency
A$100 Hz$ and $150 Hz$
B$20 Hz$ and $25 Hz$
C$400 Hz$ and $500 Hz$
D$1000 Hz$ and $1500 Hz$
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B$20 Hz$ and $25 Hz$
b (b) For hearing beats, difference of frequencies should be approximately $10 Hz.$
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