Quick Quiz

Try these multiple-choice questions to see if you understand the basic definitions for wave properties.

1. Two corks P and Q are floating on the water surface as shown. When water waves pass by it is found that when P is at its highest position, Q is at its lowest and vice versa.
   

   The wavelength of the water waves might be:

   a) 2.4 cm only b) 4 cm only c) 12 cm only d) 2.4 cm or 4 cm only e) 2.4 cm or 4 cm or 12 cm
   
   

2. The dots in (i) represent the positions of undisturbed air molecules and those in (ii) represent their positions when a sound wave passes through.

   
   The wavelength of the sound wave is:

   a) 2d b) 3d c) 6d d) 12d e) d
   

3. The figure shows the variation of the displacement with time at a certain point for two waves.
   

   What quantities of the waves are the same?

   a) period only b) wavelength only c) amplitude only d) period and wavelength only e) period and amplitude only
   

4. A point on a string vibrating sinusoidally is now at one of its extreme positions. If it takes 2 s for it to move to the other extreme position, what is the period of the wave?
   a) 1 s b) 2 s c) 4 s d) 8 s e) 0.5 s
5. A sound source in air emits sound waves of wavelength equal to 11 m. If the velocity of sound in air is 343 ms-1, how many vibrations does the source make in 0.1 s?

   a) 0.032 b) 3 c) 30.1 d) 31.1 e) 363