Question

Q I. Fill in the blanks. 1. To and fro or back and forth motion of an object is called ___________. 2. In humans the sound is produced by the ________ or the ___________. 3. Frequency determines the ________ of a sound. 4. _________ and _______ are two important properties of sound. Q II. How do astronauts talk to one another on the surface of moon and Why? Q III. Why do we not hear the screams of a bat? Q IV. Which of the following frequency of sound can be heard by a dog but not by a man? {a} 50,000 hertz {b} 15,000 hertz Q V. Write full form of SONAR. Also write, its uses. Q VI. What is the difference between noise and music?

Answer 1

Answer:

1. vibratary motion
2. vocal cord and the mouth
3. -
4. Amplitude and Frequency

2.. The astronauts talk to one another on the surface of moon through the wireless sets that uses radio waves .This is because radio waves can travel through vacuum ,where sound waves cannot travel through vacuum as they are required material medium for their propagation

4..50,000 Hertz

5.. sound navigation ranging

6.. sound is what that we hear. Noise is unwanted sound .

the difference between noise and sound depend upon the listener and the circumstances

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Answer 2

Answer:

1. oscillatory motion
2. airflow , air pressure
3. pitch
4. amplitude , frequency

question s.

1. astronauts talks to one another on the surface of moon through wireless sets that uses radio waves. this is because radio waves can travel through vacuum , whereas sound waves cannot travel through vacuum as they require material medium for their propagation .
2. ( a ) 50,000 hertz
3. ( sound navigation and ranging )

a. It is a technique based on sound propagation .

b . It is used to detect , navigate or communicate objects under or on the surface of water using sound propagation.

4. music - ( a ) music is the art of arranging and combining sounds in order to create a harmonious melody .

( b ) . music is pleasing to the ears .

noise - ( a) noise is an unwanted sound that is usually very loud and meaningless.

( b) . noise is an unpleasant sound .

Explanation:

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