(1) Every source of sound is a vibratory body.

(2) Vocal cord of females are longer than that of males.

(3) Sound travels in the air as longitudinal waves.

(4) The lower end of the human audible range of sound is 5 Hz.

(6) Loudness of sound depends on frequency of vibration.

(7) Sound travels faster in liquids than in solids.

(8) The reflection of sound obeys the laws of reflection.

(9) Unit of time period is hertz.

(10) Auditoriums are designed for no echo formation.

(5) The time taken for one vibration in a wave is called time period.

(1) In a sitar smaller length of the string produces __________ sound.

(2) Sound cannot travel in __________.

(4) In longitudinal waves particle vibration and movement of wave is in __________ direction.

(5) Sound above human hearing range is called __________.

(6) A sound of high frequency will have __________ pitch.

(7) Sound heard after its reflection from a rigid surface is called __________.

(8) Sound travels faster in liquids than in __________.

(9) Unit of frequency is __________.

(10) Sound cannot travel in __________.

(3) For a wave the maximum displacement of a medium from mean position is called its __________.

(5) How do we produce sound from our throat?

(8) How can a room be made sound proof?

(1) How is sound produced?

(2) What are longitudinal waves?

(3) Why sound cannot travel in vacuum?

(4) How can you say that shorter vibrating body produces a shrill sound?

(6) Why it can be difficult to converse in a large bare room?

(7) Why is thunderclap heard few seconds after lightning?

(9) What is loudness of sound?

(10) What do you understand by echolocation?

(3) How can you prove that sound is conducted by solids?

(5) If a huge explosion occurred on the Moon it will be seen but not heard. Can you explain why?

(7) What are the various uses of ultrasound?

(1) Explain the terms, amplitude and frequency giving examples.

(2) How can you justify that sound travels in water but not in vacuum?

(4) How can you prove that light travels much faster than sound?

(6) How will you prove that loud sound is produced by large vibrations?

(8) Why echo formed in a small room does not disturb the quality of sound?

(9) Write a note on sound absorbers giving practical examples.

(10) What are different uses of echo and sonar?

Sound is produced when an object is made to vibrate.

increase

High wall made of concrete

Sound travels in transverse waves in air.

10,000 Hz

They can listen to infrasonic sound

In a small room music is not affected by echo formation.

High wall made of concrete