Q16 of 199 Page 185

What name is given to those aircrafts which fly at speeds greater than the speed of sound?

Supersonic aircrafts is the name given to those aircraft which fly at speed greater then the speed of sound.


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14

If you want to hear a train approaching from far away, why is it more convenient to put the ear to the track?

 15

What is the speed of sound :

(a) in air?


(b) in water?


(c) in iron?

 17

A jet aircraft flies at a speed of 410 m/s. What is this speed known as?

 18

What is meantby supersonic speed?