A train approached a tunnel surrounded by a cliff. The driver sends a short whistle when 1.665 km away. The echo reaches him 9s later. Find the speed of the train if speed of sound in air is 340m/s.
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Distance traveled by the sound ( train to tunnel and tunnel to train ) is 2 * 1.665 Km.
Speed=Distance / time
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avani811:
distande traelled by sound which u have taken as 340 × 9 should by (340×9)/2. Since when echo is heard, 2d= Vt
so according to me the speed of train then should be 15m/s
Answered by
11
Dear Student,
◆ Answer -
The speed of the train will be 30 m/s.
● Explanation -
Total distance travelled by sound is 9 × 340 = 3060 m.
Thus distance travelled by train in this time is 2×1665 - 3060 = 270 m.
Speed of the train thus will be 270/9 = 30 m/s.
Thanks dear. Hope this is helpful to you...
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