6.2 reflections of waves

6.2 REFLECTION OF 6.2 REFLECTION OF WAVES

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6.2 REFLECTION OF6.2 REFLECTION OFWAVES

LEARNING OUTCOMES

Describe reflection of waves in termsof the angle of incidence, angle ofreflection, wavelength, frequency,speed and direction of propagation

Describe reflection of waves in termsof the angle of incidence, angle ofreflection, wavelength, frequency,speed and direction of propagationspeed and direction of propagation

Draw a diagram to show reflection ofwaves

speed and direction of propagation

Draw a diagram to show reflection ofwaves

Reflection of Waves

When sea waves move towards the beach andhit a boulder, the waves will be reflected.

What is Reflection of Waves?Reflection of waves occurs when a

wave strikes an obstacle.

The wave undergoes a change indirection of propagation when it isreflected

Incident wave: the wave before itstrikes the obstacle

Reflected waves: the wave which hasundergone a change in direction ofpropagation after reflection.propagation after reflection.

i = angle of incident – the anglebetween the incident wave and thenormal line.

r = angle of reflection – the anglebetween the reflected waves and thenormal line.

Law of Reflection

The angle of incidence, i is equal tothe angle of reflection, r

Reflection of plane water wavesin a ripple tank

Set up a ripple tank.

Switch on the motorto set the vibrating.Increase thefrequency of thewaves by increasingwaves by increasingthe voltage powersupply to the motor.

Observe the reflectedwave by using astroboscope.

Draw a diagram to show reflection of waves.

Discussion

What is the relationship between theangle of incidence and the angle ofreflection when water waves are reflectedby a straight reflector?

The angle of incidence is equal to theangle of reflection.angle of reflection.

When the water waves with a wavelength λ move towards a straight reflector, what isthe wavelength of the reflected waves?

Wavelength of the incident waves is equalto the wavelength of the reflected waves.

Discussion

When the frequency of the vibrating bar of theripple tank is reduced,

(i) What will happen to the wavelength, λ, of the incident waves?

increase increase

(ii) Will the velocity of the water waveschange? Explain your answer.

Velocity does not change. The depth of thewater is the same.

Conclusion

The wave undergoes a change indirection of propagation when it isreflected.

The frequency, wavelength and speedThe frequency, wavelength and speedremain the same after reflection.

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