The minimum distance in air between the observer and the obstacle for an echo to be heard clearly at temperatures higher than $25^{0} C$ is :

less than

17.2 m

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more than

17.2 m

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equal to

17.2 m

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unpredictable

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Solution

The correct option is B more than $17.2 m$
The minimum distance in air between the observer and the obstacle for an echo to be heard clearly at temperatures higher than $25^{0} C$ is more than $17.2 m$ . The speed of sound increases with rise in temperature.

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The minimum distance in air between the observer and the obstacle for an echo to be heard clearly at temperatures higher than 250C is :

The correct option is B more than 17.2mThe minimum distance in air between the observer and the obstacle for an echo to be heard clearly at temperatures higher than 250C is more than 17.2m. The speed of sound increases with rise in temperature.

The minimum distance in air between the observer and the obstacle for an echo to be heard clearly at temperatures higher than $25^{0} C$ is :

The correct option is B more than $17.2 m$
The minimum distance in air between the observer and the obstacle for an echo to be heard clearly at temperatures higher than $25^{0} C$ is more than $17.2 m$ . The speed of sound increases with rise in temperature.