Question

thus for sound to be geared it should take how many seconds from the starting point and get reflected back​

Answer 1

Answer:

Sound bounces off a solid or a liquid like a rubber ball bounces off a wall. Like light, sound gets reflected at the surface of a solid or liquid and follows the same laws of reflection as you have studied in earlier classes. The directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence, and the three are in the same plane. An obstacle of large size which may be polished or rough is needed for the reflection of sound waves.

Activity

• Take two identical pipes, as shown in Fig. 12.11. You can make the pipes using chart paper. The length of the pipes should be sufficiently long as shown.

• Arrange them on a table near a wall.

• Keep a clock near the open end of one of the pipes and try to hear the sound of the clock through the other pipe.

• Adjust the position of the pipes so that you can best hear the sound of the clock.

• Now, measure the angles of incidence and reflection and see the relationship between the angles.

• Lift the pipe on the right vertically to a small height and observe what happens.

Answer 2

Sound bounces off a solid or a liquid like a rubber ball bounces off a wall. Like light, sound gets reflected at the surface of a solid or liquid and follows the same laws of reflection as you have studied in earlier classes. The directions in which the sound is incident and is reflected make equal angles with the normal to the reflecting surface at the point of incidence, and the three are in the same plane. An obstacle of large size which may be polished or rough is needed for the reflection of sound waves.