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Two tones of frequencies n(1) "and" n(2)...

Two tones of frequencies `n_(1) "and" n_(2)` are sounded together. The beats can be heard distinctly when

A

`10 lt (n_(1) - n_(2)) lt 20`

B

`5 lt (n_(1) - n_(2)) gt 20`

C

`5 lt (n_(1) - n_(2)) lt 20 `

D

`0 lt (n_(1) - n_(2)) lt 10`

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