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WorksheetsEM Waves
Total questions: 23
Worksheet time: 14mins
Electromagnetic (EM) waves are which type of waves?
Longitudinal
Mechanical
Transverse
When EM waves interact with substances, which of the following means the energy is taken into the substance?
transmit
absorb
reflect
refract
What is the speed of all EM waves in a vacuum?
300,000 m/s
3,000,000 m/s
30,000,000 m/s
300,000,000 m/s
Which part of the EM spectrum has the longest wavelengths?
radio waves
microwaves
infrared
visible light
When rays of light cross a boundary at an angle they can change direction. This is called ...
reflection
diffraction
rarefaction
refraction
If a wave slows down when it crosses a boundary, which way will the wave bend?
Towards the normal
Away from the normal
Which part of the EM spectrum is produced by changes in the nucleus of an atom?
X-rays
Visible light
Ultraviolet (UV)
Gamma rays
What happens to the electrons within an atom, when energy from an EM wave is absorbed by the atom?
They orbit the nucleus at a faster speed.
They move closer to the nucleus.
They move further away from the nucleus.
They move to a lower energy level.
How do EM waves ionize an atom?
The electrons have enough energy to combine with a proton to from a neutron.
The electrons have enough energy to move completely free of the atom leaving the atom negatively charged.
The electrons have enough energy to move completely free of the atom leaving the atom positively charged.
Protons in the nucleus are able to become free.
Which type of EM wave are produced by oscillations in an electrical circuit?
Infrared radiation
Visible light
X-rays
Radio waves
Which part of the EM spectrum pass through soft tissues of the body, but not bone, and so are use for medical imaging?
Visible light
X-rays
Ultraviolet (UV)
Radio waves
When a radio wave is absorbed by a receiver aerial, what is created?
A current
A direct current
An alternating current
What are radio waves NOT used for?
transmitting television
mobile phones
FM radio
Satellite communications
Which of the following parts of the EM spectrum are NOT ionising
Gamma rays
Microwaves
X-rays
Ultraviolet
Which part of the EM spectrum can damage skin, age skin prematurely and cause cataracts?
Gamma rays
Microwaves
X-rays
Ultraviolet
Which part of the EM spectrum is used in high doses to kill cells and bacteria?
Gamma rays
Microwaves
Visible light
Ultraviolet
A perfect black body (a) 100% of the radiation that falls upon it.
The (a) an object is, the more infrared radiation it emits.
Which surface is the best at emitting infrared radiation?
matt white
shiny black
shiny white
matt black
The hotter an object is, the peak wavelength that it emits shifts to (a) wavelengths.
For an object at a constant temperature, the amount of infrared radiation emitted (a) the amount of infrared radiation absorbed.
Which part of the EM spectrum is absorbed by greenhouse gases?
microwaves
visible light
x-rays
infrared
A filament bulb emits visible light at a rate of 36 W, and emits infrared light at a rate of 54 W. What is the efficiency of the filament bulb?
60%
40%
67%
33%
