To hear an echo, time interval between the original sound and the echo is ___.

less than 0.05 s

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more than 0.1 s

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0.05 s

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less than 0.1 s

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Solution

The correct option is B more than 0.1 s
To hear an echo, the time difference between the original sound and its echo should be atleast $0.1 s$ , i.e. greater than or equal to $0.1 s$ .

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To hear an echo, time interval between the original sound and the echo is ___.

The correct option is B more than 0.1 sTo hear an echo, the time difference between the original sound and its echo should be atleast 0.1 s, i.e. greater than or equal to 0.1 s.

The correct option is B more than 0.1 s
To hear an echo, the time difference between the original sound and its echo should be atleast $0.1 s$ , i.e. greater than or equal to $0.1 s$ .