P1 Revision Booklet

EM spectrum

Easy (Grade D/E)

Q1.        (a)      The diagram below shows six of the seven types of wave that make up the electromagnetic spectrum.
 
Gamma
rays	 	Ultraviolet	Visible
light	Infrared	Microwaves	Radio
waves	

(i)      What type of electromagnetic wave is missing from the diagram?
........................................................................................................................
(1)

(ii)     Which of the following electromagnetic waves has the most energy?
Draw a ring around the correct answer.
 
gamma rays	radio waves	visible light	

(1)

(iii)    Which of the following electromagnetic waves is given out by a TV remote control?
Draw a ring around the correct answer.
 
infrared	microwaves	ultraviolet	

(1)

(b)     Draw a ring around the correct answer in the box to complete the sentence.
 
 	a slower speed than	 	
Microwaves travel through a vacuum at	the same speed as	radio waves.	
 	a faster speed than	 	

(1)

(c)     The diagram shows waves being produced on a rope.
The waves are not reflected by the wall.

(i)      Draw an arrow on the diagram to show the direction in which the waves transfer energy.
(1)

(ii)     Which one of the arrows, labelled, X, Y or Z, shows the amplitude of a wave?
 
Write the correct answer in the box.		

(1)

(iii)    The waves produced on the rope are transverse.
Name one other type of transverse wave.
........................................................................................................................
(1)

(d)     The rope is shaken up and down, producing 3 waves every second.The waves have a wavelength of 1.2 metres.
(i)      State the frequency of the waves.
                                                                                      .............................. Hz
(1)

(ii)     Calculate the speed of the waves.
Use the correct equation from the Physics Equations Sheet.
Show clearly how you work out your answer.
........................................................................................................................
........................................................................................................................
                                      Wave speed = .................................................. m/s
(2)
(Total 10 marks)
 
Q2.          (a)    The diagram shows the electromagnetic spectrum.
The pictures show four devices. Each device uses a different type of electromagnetic wave.
Draw one line from each device to the type of electromagnetic wave the device uses. One line has been drawn for you.

(3)

(b)     Visible light waves travel through space at a speed of 300 000 km/s.
How fast do infrared waves travel through space?
........................................................................................................................
(1)

(c)     Draw a ring around the correct answer in the box to complete the sentence.
 
 	a longer wavelength than	 	
Infrared waves have	the same wavelength as	visible light waves.	
 	a shorter wavelength than	 	

(1)

(d)     The two diagrams, A and B, show a light ray travelling into a glass block.

(i)      Look at Diagram A.
What name is given to the process that happens as the light enters the glass block?
........................................................................................................................
(1)

(ii)      Look at Diagram B.
The light enters the glass block without changing direction.
Why?
........................................................................................................................
........................................................................................................................
(1)

(Total 7 marks)
 Q3.          (a)     Mobile phones send digital signals using electromagnetic waves.
(i)      Which one of the following types of electromagnetic wave is used to carry information between masts in a mobile phone network?
Draw a ring around your answer.
light	microwave	radio	

(1)

(b)     Some people worry that using a mobile phone may be bad for their health.
Look at this information taken from a recent newspaper article.
•  Scientists in Sweden found that the regular use of a mobile phone increases the risk of a cancerous growth between the ear and the brain.
•  Some people who use mobile phones for a long time complain of headaches and tiredness. The same effect has not been noticed in laboratory tests.
•  There is no reliable evidence to link using mobile phones with ill health.
•  The waves from a mobile phone are not strong enough to cause long-term heat damage to cells in the body.	

(i)      Complete the following sentence by drawing a ring around the word in the box that is correct.
The evidence from different scientists doing the same investigation is reliable if
 
all the scientists get	different
identical
random	 
results.	

(1)

(ii)     What information in the article supports the idea that mobile phones are bad for your health?
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)

(iii)     Some scientists say that using a mobile phone is totally safe.
What information in the article supports this view?
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(Total 6 marks)
 Q4.          The diagram shows some of the kinds of waves in the electromagnetic spectrum.
Choose words from this list to complete the empty boxes on the diagram.
          alpha radiation         infrared radiation          radio waves       X-rays

(Total 3 marks)
 
Q5.          The table shows the electromagnetic spectrum.
Three types of wave have been missed out.

(i)      Use words from the box to complete the table.
 
      infra red rays      radio waves           X-rays	

(2)

(ii)     Which one of the following gives a use of gamma rays?
         Put a tick () in the box next to your choice.
to communicate with satellites		
to see objects		
to kill cancer cells		

(1)

(iii)     Complete the following sentence by drawing a ring around the correct word in the box.
 
 	energy	 	
All electromagnetic waves move	gases	from one place to another.	
 	particles	 	

(1)
(Total 4 marks)
 Q6.          The diagram shows a small part of the electromagnetic spectrum divided into seven sections.
The different properties of the waves in each section make them useful in different ways.

The waves in which section, A, B, C, D, E, F or G, are:
(a)     used to send a signal to a satellite in space
.........................................
(1)

(b)     used to communicate with a submarine under the water
.........................................
(1)

(c)     used by a radio station to broadcast programmes around the world
.........................................
(1)

(d)     the waves with the shortest wavelength?
.........................................
(1)
(Total 4 marks)
 EM spectrum-Mark scheme

M1.         (a)      (i)     X-ray(s)
1

(ii)     gamma rays
1

(iii)    infrared
1

(b)     the same speed as
1

         (c)     (i)      horizontal arrow drawn pointing to the right
judge by eye
accept drawn anywhere on diagram
1

(ii)     Y
1

(iii)     any one from:
•        any type of electromagnetic wave
accept electromagnetic wave(s)
•        water (wave)
do not accept seismic waves
•        (earthquake / seismic) S waves
do not accept P waves
do not accept earthquakes
1

(d)     (i)      3
1

(ii)     3.6
or
their (d)(i) × 1.2 correctly calculated
v = f × λallow 1 mark for correct substitution
ie 3 or their (d)(i) × 1.2 provided that no subsequent step is shown
2
[10]
 M2.          (a)     3 lines drawn linking:
camera to visible light
1
television to radio waves
1

remote control to infrared

if more than one line is drawn from any device all those lines are incorrect
1

(b)     300 000 km/s
unit required
or
300 000 000 m/s
accept the same (as light)
accept the speed of light
1

(c)     a longer wavelength than
1
(d)     (i)      refraction
do not allow a misspelling that might be reflection
1
(ii)     travelling along the normal
accept light is at 90° to the surface / block
light is not entering at an angle is insufficient
1
[7]
 M3.          (a)     (i)      microwave
1
(b)     (i)      identical
1
(ii)     •       increased risk of cancerous growth (between ear and brain)
1
•        complaints of headaches and tiredness
1

(iii)     any two from:
•        tests in a laboratory did not give effects of tiredness or headaches
•        waves not strong enough to cause long term heat damage to cells
•        evidence to link mobile phones and ill health is not reliable
2
[6]
 M4.          X-rays                     
 
for 1 mark each
[3]

##
(i)      X-rays
      infra red (rays)
      radio (waves)
all three in correct order
allow 1 mark for 1 correct
2

(ii)     to kill cancer cells
1
(iii)     energy
1
[4]