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You are advised to spend 60 minutes answering the questions in this bool<let.

QUESTION ONE: LIGHT AND PRIS·M$ · ?

When a ray of white light is shone into a prism, a spectrum of colours emerges on the other~€--of the prism. In the diagram below, the colour B is seen in the middle of the spectrum. • .... t••.t ··

A

B

c

(a) Name the celoms labelled A, B and C, in the diagr~an.!!1:.-. --<:::::::::...--

A = RQd --....---B = -~_(l_ C = V;ol; f

..____-----

(b) Explain what this effect shows about the natme of white light.

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The direction of the incident white ray is now adjusted so that the green component qfthe white light emerges along the face AB of the prism, as shown in the diagrain below. The green light makes an angle of 4 7° to the side of the glass inside the prism.

A

white light

C £__ _ __________ __:. B

(c) (i) Calculate the critical angle for green light in the prism.

(d)

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(ii) State and explain what will be seen if the angle of the green light with the f: ce AB of the prism was slightly increased from47°.

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QUESTION TWO: WATER WAVES •

A radio-controlled toy boat is sa iling in a lake. As it sails, waves are produced behind the boat. At one point of travel, the boat produces 10 waves in 5.0 seconds.

(a) (i) Define the tenn 'period'.

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(ii) Calculate the period of the waves produced.

i) - IO - 0. 5

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(b) A paddle from a canoe produces 9 waves in 15 s. Each wave h~avels 4.8 min 12 s.

Calculate the wavelength of waves produced by the paddle.

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/ Physics 90938, 2013

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A gentle wind causes straight waves on the lake surface. The diagram shows wav.e~s...aRP~oaching the edge of a wall. The depth of the water is the same on either side of the wall~. · 0: J) 'UlJ.t>e.. ....,.

(c)

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(d) A short time later, a wind produces waves of higher frequency.

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QUESTION THR~E: RADIO-CONTROLLED BOAT

A radio-controlled toy boat has a small siren that produces a sound. The sir~en~ca:ll.nwbLSewtMUJI&ll..I.Jll.~---,

sending radio waves from a remote control. a..: 0 ne GO .,recJ::. (a) State TWO differences between the r adio waves and the souf ave dJ:f{erer. 02-

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(b) The siren produces a frequency of 800 Hz, and the wavelength of the sound waves in air is 41 em.

Show that the speed of sotmd in air is 328 m s-1.

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Physics 90938. 201 3

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(c) The boat is 180 m from the remote control. A radio wave is sent to turn on the siren. A person is standing with the remote control.

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Calculate the time from when the remote control sends the radio wave to when the person hears the sound.

Explain any assumptions you make.

The speed of sound in air is 328 m s-1.

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(d) Explain how sound energy is transferred from the siren to the person holding the remote control, even though no air particles move from the siren to the person.

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-----Physics 90938, 201 3

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QUESTION FOUR: REFLECTION IN A WINDOW

The diagram below shows a wave travelling to the right.

(i)

(ii)

d' . a> wave 1rect10ll

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On the diagram above, label the amplitude and the waveleng~tl e W11Ve. .l-M! CO(reCJ

Describe the motion of the particles in this wave. \ck.l \ i ~ OAd cie.sa• • Of'\..

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Tom looks through a glass window and sees his own reflection in the glass: -----

(b) On the diagram below, draw TWO rays to show how Tom can see his right hand in the glass. Locate and label the image of his right hand.

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Physics 90938, 2013

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(c) Explain whether Tom w ill be able to see hi s feet in the glass when he stands as shown in the

diagram.

You may draw on the diagram below to aid your answe1

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Physics 90938, 2013

Question Four (d) continues on the following page.

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(d) The diagram below shows a ray of light from outside the window reaching Tom after it has travelled through the glass.

light reaching Tom

air glass air

/

(i) Complete the diagram to show the path of the ray:

• when it travels through the glass, and

• when it is incident on the opposite side of the glass.

(ii) Name the effect that occurs when light passes into the glass, and give a reason why this occurs.

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ASSESSQ USE ON\

QUESTION NUMBER

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Extra paper if required.

' Write the question number(s) if applicable.

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\ Physics 90938, 201.3

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