Question

Draw a displacement-time graph for sound waves A and B having amplitude 1cm and 2cm respectively​

Answer 1

Answer:

"Draw a displacement-time graph for sound waves A and B having amplitude 1cm and 2cm respectively

Explanation:

the time graph is in the attachment "

Answer 2

Answer:

17 m

Explanation: An echo is heard distinctly if it reaches the ear at least 0.1 s after the original sound.

If d is the distance between the observer and the obstacle and V is the speed of sound, then the total distance travelled by the sound to reach the obstacle and then to come back is 2d and the time taken is,

t = Total distance travelled/Speed of sound = 2d/V

or, d = V t/2

Putting t = 0.1 s and V = 340 m/s in air at ordinary temperature, we get:

d = (340 x 0.1)/2 = 17 m

Thus, to hear an echo distinctly, the minimum distance between the source and the reflector in air is 17 m.

Explanation: