5.3 Reflection of waves

Which quantity changes after the wave is being reflected?

• Speed

• Direction of propagation of wave

• Frequency

• Wavelength

Which comparison is correct about the reflected sound wave and the incident sound wave?

• The speed of the incident wave

  and the reflected wave is the

  same

• The angle of the incident wave is greater than the

  angle of the reflected wave

• The frequency of the incident

  wave is less than the reflected

  wave

• The wavelength of the incident wave is shorter

  than the reflected wave

A ship transmits an ultrasonic wave pulse to the seabed and receives an echo 0.12s later. The speed of the ultrasonic waves in sea water is 1500 m s–1 . What is the depth of the sea?

• 180

• 330

• 90m

• 360

Bright fringes produced on the white screen of ripple tank represent the wavefront for trough.

• True

• False

Answer explanation

Bright fringe represent the wavefront for crest while dark fringe represent the wavefront for trough.

Direction of propagation of the wave is _____ to the wavefront.

• parallel

• perpendicular

• same

• circular

The phenomenon of reflected waves cause the angle of incidence equal to angle of reflection.

• True

• False

Choose the characteristics of waves that do not change after the phenomenon of reflection.

• Wavelength

• Direction of propagation

• Speed

• Frequency

Below are the example and applications of reflection of waves, except

• Radio waves

• Ultrasonic waves

• water waves moving across shallow water

• Echo

______ – the angle between the normal and the reflected ray.

• Angle of incidence

• Angle of reflection

• Angle of coincidence

• Angle of direction

The imaginary line perpendicular to a reflecting surface is called _____.

• crooked line

• parallel line

• angular line

• normal line