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P13 Electromagnetic Waves
1.
What type of wave are electromagnetic waves?
a) transverse
b) longitudinal
2.
At what speed to electromagnetic waves travel through space or air?
a) 3 x 10
8
m/s
b) 330 m/s
c) It depends upon the frequency.
d) 8 x 10
3
m/s
3.
Which type of electromagnetic wave has the shortest wavelength?
a) microwaves
b) visible light
c) gamma rays
d) radio waves
4.
Which type of electromagnetic wave has the longest wavelength?
a) gamma rays
b) visible light
c) infrared
d) radio waves
5.
Which type of electromagnetic wave has the lowest frequency?
a) X-rays
b) infrared
c) radio waves
d) gamma rays
6.
Which type of electromagnetic wave has the highest frequency?
a) radio waves
b) X-rays
c) microwaves
d) gamma rays
7.
Which electromagnetic wave has a wavelength between infrared and ultraviolet?
a) X-rays
b) microwaves
c) visible light
d) gamma rays
8.
Which electromagnetic wave has a wavelength between gamma rays and ultraviolet?
a) radio waves
b) visible light
c) microwaves
d) X-rays
9.
Which electromagnetic wave has a frequency between radio waves and infrared?
a) microwaves
b) radio waves
c) infrared
d) gamma rays
10.
Which electromagnetic wave has the highest speed?
a) radio waves
b) infrared
c) microwave
d) they are all the same
11.
Which electromagnetic wave(s) is detected by our eyes?
a) visible light and ultra violet
b) infrared to ultraviolet
c) visible light
d) ultra violet
12.
Which of the following words means that the energy from an electromagnetic wave is transferred to a substance?
a) refracted
b) transmitted
c) absorbed
d) reflected
13.
Which of the following words means that the energy from an electromagnetic wave passes through a substance?
a) absorbed
b) transmitted
c) reflected
d) refracted
14.
Which of the following words means an electromagnetic wave changes speed and direction when it passes through a substance?
a) reflected
b) transmitted
c) absorbed
d) refracted
15.
Which of the following words means that the energy from an electromagnetic wave is returned from the surface of a material?
a) reflected
b) transmitted
c) refracted
d) absorbed
16.
Which of the following causes electromagnetic waves to be refracted at a boundary between two materials?
a) a change in wavelength
b) a change in speed
c) a change in amplitude
d) a change in frequency
17.
What name is given to the dotted line F that is at 90 degrees to the air-glass boundary?
a) incident line
b) perpendicular ray
c) dashed ray
d) normal
18.
What name is given to the ray E arriving at the air-glass boundary?
a) air ray
b) normal ray
c) incident ray
d) initial ray
19.
Which ray correctly shows the reflected ray?
a) A
b) B
c) C
d) D
20.
Which ray correctly shows the refracted ray?
a) A
b) B
c) C
d) D
21.
Which angle is the angle in incidence?
a) 1
b) 2
c) 3
d) 4
22.
Which angle is the angle in reflection?
a) 1
b) 2
c) 3
d) 5
23.
Which angle is the angle in refraction?
a) 2
b) 3
c) 4
d) 5
24.
What do the parallel lines in the diagram of refraction represent?
a) wave fronts
b) normal lines
c) boundary lines
d) rays
25.
What happens to the wavelength of the waves as then enter the glass?
a) it increases
b) it decreases
c) it does not change
26.
What happens to the speed of the waves as they enter the glass?
a) it decreases
b) it increases
c) it does not change
27.
What happen to the direction of travel of the waves?
a) It does not change
b) It bends away from the normal.
c) It bends towards the normal.
28.
Which is the larger angle?
a) The angle on incidence.
b) The angle of refraction.
29.
How are radio waves produced?
a) radio frequency lamps
b) radioisotope generators
c) oscillations in electric circuits
d) radioactive decay
30.
Which of the following is the best description of what happens when radio waves are absorbed?
a) The radio waves turn into sound waves that we can listen to.
b) An alternating current of the same frequency as the radio wave is created.
c) Electrons absorb the energy and jump to a higher energy level.
d) Radio waves increase the specific heat capacity of the absorbing material.
31.
Which type of change can generate electromagnetic waves over a wide frequency range.
a) Changes in temperature.
b) Changes in internal energy.
c) Changes in the speed of light.
d) Changes in atoms and their nuclei.
32.
Which type of electromagnetic wave originate from the atomic nucleus?
a) ultraviolet
b) gamma rays
c) microwaves
d) X-rays
33.
Which electromagnetic waves are hazardous to human body tissue?
a) ultraviolet, X-rays and gamma rays
b) X-rays and gamma rays
c) ultraviolet and gamma rays
d) microwaves, X-rays and gamma rays
34.
Which is the best definition for radiation dose?
a) The amount of radiation energy absorbed.
b) A measure of the risk of harm from ionising radiation.
c) The penetrating power of the radiation.
d) The activity of a radioactive source.
35.
What is the usual unit used for radiation dose.
a) Joule (J)
b) Sievert (Sv)
c) Hertz (Hz)
d) half-life (t)
36.
Which type of electromagnetic wave commonly causes skin to age prematurely and increases the risk of skin cancer.
a) ultraviolet
b) gamma
c) microwave
d) radio
37.
Which electromagnetic waves are both ionising and can both cause mutation of genes and cancer?
a) X-rays and gamma rays
b) visible light and gamma rays
c) X-rays and radio waves
d) microwaves and ultraviolet
38.
Which type of electromagnetic wave is commonly used for medical imaging and treatments?
a) microwaves
b) radio
c) visible light
d) X-rays and gamma rays
39.
Which type of electromagnetic wave is commonly used for fibre optic communications?
a) visible light
b) X-rays
c) microwaves
d) ultraviolet
40.
Which type of electromagnetic wave is commonly used for electrical heaters, cooking food and thermal cameras?
a) infrared
b) X-rays
c) ultraviolet
d) visible light
41.
Which type of electromagnetic wave is commonly used for cooking food and satellite communications?
a) infrared
b) gamma rays
c) microwaves
d) X-rays
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