Question

Q1. Fill in the blanks:

1. Sound is produced by ________________ bodies.

2. In humans, the sound is produced by the ____________.

3. Sound always travels through a ___________. It cannot travel in a ____________.

4. The thin membrane called _____________ present in our ears, senses the vibrations and sends them as signals to the _____________.

5. The no. of vibrations per second is called ______________. It is expressed in _____________.

6. Loudness of sound is proportional to the square of the ____________

7. Larger is the amplitude of vibration, the __________ is the sound.

8. Higher the frequency of vibration, the higher is the ____________.

9. A bird makes ____________ sound whereas a lion makes ___________ sound. (low pitched/high pitched)

10. For human ears, the range of audible frequency is from _____________Hz. to ______________ Hz.

Answer 1

Answer:

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Answer 2

Answer:

1. Vibrating

2. Larynx

3. Air, vaccum

4.

5. Frequency,hertz

6. Amplitude

7.

8. Sound

9. High pitched, low pitched

10. 20 Hz to 20 KHz