How is sound produced in school bell?Q18. Bats have no eyes then how do they catch their prey?Q19. Write the uses of ULTRASOUND.Q20. Write three uses of multiple reflection of sound.

Explain how sound is produced by your school bell.

Explain how bats use ultrasound to catch prey.

Good Morning Students As we have completed the chapter SOUND, kindly start making notes according to given headlines:Characterstics of Sound waveRelation between velocity, frequency and wavelength*Factors affecting Speed of Sound *Sonic Boom *Reflection of Sound and it's applications*echo*calculation of minimum distance for echo production *Reverbration Ultrasound and it's applications*SonarCharacterstics of Sound

Q1.Which sound has a higher pitch, guitar or car horn?Q2. Name three animals which can hear ultrasonic vibrations.Q3.How are the wavelength and frequency of a sound related to its speed?Q4. Why sound wave is called a longitudinal wave?Q5. Frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?Q6. What is an echo?Q7.What do waves transport - matter or energy?Q8. What is a wave?Q9. Which characteristics of the sound help us to identify a person by his voice if he issitting in a dark room?Q10. If the amplitude of a wave is doubled, what will be the effect on its loudness?

Which wave property determines a) loudness, b) Pitch?Q12. Why are the ceilings of concert halls curved?Q13. How is ultrasound used for cleaning?Q14. Sound is produced due to a vibratory motion, then why a vibrating pendulum doesnot produce sound?Q15. A sound produces 20 crests and 20 troughs in 0.4 sec. Find the frequency of the wave.Q16. Why sound waves are called mechanical waves?