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? (Speed of sound in air = 340 m/s

A man is lying on the floor of a large, empty hemispherical hall, in s

1.	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? (Speed of sound in air = 340 m/s
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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 0.2 s. What is the radius of the hall? (Speed of sound in air = 340 m/s

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