When sound travels from a tuning fork to your ear, which of the following actually reaches your ear? Class 9

When sound travels from a tuning fork to your ear, which of the following actually reaches your ear? Class 9

Question 1.

When sound travels from a tuning fork to your ear, which of the following actually reaches your ear? (Page 192) Class 9

(i) Air particles near the tuning fork.

(ii) Energy carried by sound waves.

(iii) The tuning fork material.

(iv) A continuous stream of compressed air.

Answer:

(ii) Energy carried by sound waves.

Explanation: In sound propagation, it is the energy that is transferred through the medium. The air particles only vibrate about their mean positions and do not travel to the ear.

Question 2.

The variation of density of the medium for two sound waves is shown in Fig. (a) and (b) . Label compression and rarefaction by C and R on it. In the graph given in Fig. (c) and (d), label the axes and draw the curves corresponding to Fig. (a) and (b). (Page 193) Class 9

Answer:

1. In the density variation diagram, regions where particles are closer together (higher density) are labelled C (compression), and regions where particles are more spread out (lower density) are labelled R (rarefaction).

For the graphs (c) and (d):

1. • X-axis: Position/ Distance;
2. Y-axis: Density A horizontal dashed line marks the average density.