1. SOUND [ IX]

                                            SHINDE  YASH   CLASSES

                                                          1. SOUND [ IX]

1. How does the sound producing a vibrating object in a medium reach your ear?

 2. Explain how sound is produced by your school bell?

 3. Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your

    friend?

 4. Determine wave property of sound:

  a. loudness   b.  pitch    c. note   d. tone e. noise     f. quality      g. Pleasant sound

 5. What are wavelength, frequency, time period and amplitude of a sound?

 6. How are the wavelength and frequency of a  sound wave related to its speed?

 7. Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 

    440m/s in a medium.

 8. Calculate the wavelength of a sound wave whose frequency is 200 Hz and speed is 

     340m/s in a medium.

 9. Calculate the wavelength of a sound wave whose frequency is 180 Hz and speed is 

     320m/s in a medium.

 10. Calculate the wavelength of a sound wave whose frequency is 180 Hz and speed is 

      350m/s in a medium.

 11. In which  of  the three  median , air , water or iron does sound  travel  the fastest at  a

      particular temperature ?

 12. What is reflection  of  sound ?

 13. What  is echo ?

 14. A person  clapped  his  hand  near  a cliff and heard  the echo  after 10 s .What  is  the distance

      of the  cliff from  the person if the speed of the sound , v is taken as 320 m/s ?

 15. A person  clapped  his  hand  near  a cliff and heard  the echo  after 8 s .What  is  the distance

      of the  cliff from  the person if the speed of the sound , v is taken as 340 m/s ?

 16. A person  clapped  his  hand  near  a cliff and  heard  the echo  after 25 s .What  is  the distance

      of the  cliff from  the person if the speed of the sound , v is taken as 420 m/s ?

 17. A person  clapped  his  hand  near  a cliff and heard  the echo  after 12 s .What  is  the distance

      of the  cliff from  the person if the speed of the sound , v is taken as 320 m/s ?

 18. The frequency  of  a sound wave  is 20 Hz . Find  its  time  period .

 19. The frequency  of  a sound wave  is 25 Hz . Find  its  time  period .

 20. The frequency  of  a sound wave  is 50 Hz . Find  its  time  period .