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Edexcel | Physics 4PH0 | W 17 1 | Q6

W 17 1
6
(a)
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2 Mark s

The box lists some devices that can be used to transfer energy from one form 

into another.

 Select a device from the box to complete each sentence.

  Sound energy is changed into electrical energy using ...............................................................................................................

  Electrical energy is changed into sound energy using ................................................................................................................

a microphone; 

 

a loudspeaker; 

W 17 1
6
(b)
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A radio station uses a short wavelength radio wave for broadcasting information.

  The wavelength is 25 m.

  The frequency is 12 000 kHz.

 

W 17 1
6
(b) (I)
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1 Mark

 

State the relationship between the speed, frequency and wavelength of a wave.

 

   

in words or

accepted

symbols any

rearranged form 

 

 

W 17 1
6
(b) (II)
Add To Classified
3 Mark s

Calculate the speed of the short wavelength radio wave.

 

speed = ............................................. m/s

   

changing kHz into Hz;

substitution;

evaluation;

e.g.

12 000 = 12 000 000

v = 25 x 12 000 000

300 000 000 (m/s) 

 

3.0 x 

(m/s)

POT error loses

the conversion

mark 

 

 

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