Sound Worksheet-6

Sound Worksheet-6

 

  1. Name the type of waves produced when a tuning fork is struck in air.

 

  1. What is the general name of the waves consisting of:

(a) Compressions and rarefactions?

(b) Crests and troughs?

 

  1. State the general name of the waves in which the particles of the medium vibrate :

(i) in the same direction as wave,

(ii) At right angles to the direction of wave.

 

  1. What type of waves are illustrated by the movement of a rope whose one end is fixed to a pole and the other end is moved up and down?

 

  1. What should an object do to produce sound?

 

  1. What is the name of the strings which vibrate in our voice box when we talk?

 

  1. Name the device which is used to produce sound in laboratory experiments.

 

  1. What is the nature of sound waves in air?

 

  1. What conclusion can be obtained from the observation that when the prongs of a sound making tuning fork touch the surface of water in a beaker, the water gets splashed?

 

  1. State whether the following statement is true or false :

Sound produced by a vibrating body travels to our ears by the actual movement of air.

 

  1. Which of the following travels slowest in air and which one fastest?

Supersonic aircraft, Light, Sound

 

  1. Which term is used to denote a speed greater than the speed of sound?

 

  1. In which medium sound travels faster: air or hydrogen?

 

  1. A tuning fork has a number 256 marked on it. What does this number signify?

 

  1.  What is the time-period of a tuning fork whose frequency is 200 Hz?

 

  1. Calculate the frequency of a wave whose time-period is 0.02 s.

 

  1. What will be the change in the wavelength of a sound wave in air if its frequency is doubled?

 

  1. If 20 waves are produced per second, what is the frequency in hertz?

 

  1. What is vacuum? Explain why sound cannot travel through vacuum?

 

  1. Explain the term 'amplitude' of a wave. Draw the diagram of a wave and mark its amplitude on it.

 

Answer:

  1. Longitudinal  waves

 

  1. (a) Longitudinal waves, (b) Transverse waves

 

  1. (i) Longitudinal waves, (ii) Transverse waves

 

  1. Transverse waves

 

  1. Vibrate

 

  1. Vocal cords

 

  1. Tuning fork

 

 

  1. That the prong of tuning fork are vibrating

 

  1. False

 

  1. Slowest: Sound

Fastest :Light

 

  1. Supersonic

 

  1. hydrogen

 

  1. Frequency  of the tuning  fork

 

  1. 5 × 10–3 s

 

  1. 50 Hz

 

  1. Wavelength is halved

 

  1. 20 Hz

 

  1. Sound waves need material medium to travel