A man is lying on the floor of a large, empty hemispherical hall, in such a way that his head is at the centre of the hall. He shouts "Hello!" and hears the echo of his voice after $0.2 s$ . What is the radius of the hall?

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Solution

Given,
Time period $T = 0.2 S e c$
Velocity of sound $V = 340 m / s$
Radius of the hall $d = ?$
Distance travel by the sound $2 d$
since, $2 d = V t$

$d = \frac{340 \times 0.2}{2} = 34 m$

Hence, the Radius of hemispherical hall is $349 m$

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A man is lying on the floor of a large, empty hemispherical hall, in such a way that his head is at the centre of the hall. He shouts "Hello!" and hears the echo of his voice after 0.2s. What is the radius of the hall?

Given,Time period T=0.2SecVelocity of sound V=340m/sRadius of the hall d=?Distance travel by the sound 2dsince, 2d=Vtd=340×0.22=34mHence, the Radius of hemispherical hall is 349m

A man is lying on the floor of a large, empty hemispherical hall, in such a way that his head is at the centre of the hall. He shouts "Hello!" and hears the echo of his voice after $0.2 s$ . What is the radius of the hall?

Given,
Time period $T = 0.2 S e c$
Velocity of sound $V = 340 m / s$
Radius of the hall $d = ?$
Distance travel by the sound $2 d$
since, $2 d = V t$

$d = \frac{340 \times 0.2}{2} = 34 m$

Hence, the Radius of hemispherical hall is $349 m$