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WorksheetsElectromagnetic waves and spectrum (Quiz)
Total questions: 45
Worksheet time: 37mins
Mechanical waves that can travel through a vacuum
Electric & Magnetic fields that travel through empty space
Waves produced by subtracting electric field's energy from magnetic field's energy
Which type of electromagnetic radiation travels at the highest speed through a vacuum?
gamma ray
x-ray
radio waves
All of the above
Which one is not a property of electromagnetic wave
They travel in a vacuum
They travel at 3 x 108 km/s in a vacuum
They are transverse waves
They do not transfer matter
What unit is used to measure the number of complete wave cycles in a second?
Hertz
seconds
Lamda
Decibels
It can convert sound waves into Audio Frequency signals.
amplifier
microphone
radio station
carrier wave
Which of these is emitted by remote controls to communicate with TV?
Radio waves
Infrared radiation
Ultraviolet
X-rays
Gamma rays
Which of these is used to detect fake banknotes?
Radio waves
Infrared radiation
Ultraviolet
X-rays
Gamma rays
Which of these is used to detect broken bones and to scan luggage at airports?
Radio waves
Infrared radiation
Ultraviolet
X-rays
Gamma rays
Which EM wave lies between radio waves and infrared radiation when listed in order of increasing frequency?
Visible light
Microwaves
Visible
Every wave in the electromagnetic spectrum has one property in common. Which property is that?
Frequency
Wavelength
Wave speed
Amplitude
Define Frequency modulation
Changing the frequency of Audio Frequency signals to match that of the carrier
Changing the amplitude of Audio Frequency signals to match that of the carrier
Making electrons vibrate in an antenna
Changing the frequency of the carrier to match that of the Audio Frequency signals
What is the speed of light in a vacuum in km/s?
3,000
300
300,000
300, 000, 000
In which region of the electromagnetic spectrum can waves have a wavelength of 1000 m?
Gamma
Radio
Visible
In which region of the EM spectrum can waves have a wavelength of 600 nm?
Visible
Radio
Microwaves
Visible light from the sun has an average wavelength 550 nm. Calculate the frequency of this light.
5.4 x 1014 Hz
5.5 x 1014 Hz
1.8 x 10-15 Hz
1.7 x 102 Hz
What is the wavelength of the electromagnetic wave used in your wifi (frequency = 2.4 GHz)?
0.125 m
0.125 cm
8 m
7.2 x 1017 m
Why are radio waves used for broadcasting?
They can penetrate the ionosphere
They have a long wavelength
They can diffract and have long wavelengths
They can diffract
What are the components of a radar?
a. satellite, transmitter, and a receiver.
b. antenna, transmitter, and a receiver.
c. antenna, satellite, and a receiver.
d. antenna, transmitter, and a satellite.
In a RADAR system, the following are true EXCEPT
The antenna whirls to send signals in all directions
The transmitter transfers the reflected waves to the observer
The transmitter produces microwave signals in pulses
The receiver detects incoming reflected pulses
Gamma rays are used in:
Nuclear weapons
Detect cracks in metals
Radiotherapy
All of the other three options
TWO uses of Microwaves are:
to heat food
in communication satellites
to transmit a radio signal
in fibre optics
Surrounding every moving electron in a wave at perpendicular angles is/are
a magnetic field
an electric field
a photon field
an electromagnetic field
What EM wave is used in sterilizing water from drinking fountains?
a. infrared waves
b. microwaves
c. radio waves
d. ultraviolet
What electromagnetic wave do humans emit as heat energy?
infrared light
ultraviolet light
visible light
microwaves
The electromagnetic spectrum is the entire range of
colors of visible light
ultraviolet light.
EM waves.
Mobile Phone
What Electromagnetic Wave is present in this device? Tick all that applies.
Radio Wave (Microwave)
Infrared Wave
Visible Light
X-ray
What type of electromagnetic wave is present in this image? Tick all that applies.
Radio wave
Infrared Wave
Ultraviolet Ray
Visible light
Electricity
Select the correct order (increasing frequency) of waves on the EMS
Certain blue lights have a frequencey of 6.91x1014Hz. What is the wavelength?
A leaf is green, what does this tell you about the light that is being absorbed?
no light is being absorbed
green is being refracted and all the colors are being absorbed.
green is being absorbed and all the other colors are reflected
green is being reflected and all the other colors are being absorbed
A high-frequency radio wave that is used in satellite communication.
microwave
radiowave
infrared rays
ultraviolet rays
This EM region is used in thermal scanner
infrared waves
x-rays
microwaves
ultraviolet rays
What vitamin is made by UV radiation to keep us healthy?
Vitamin A
Vitamin B
Vitamin C
Vitamin D
It is used to find position and speed of objects by bouncing radio waves off the object.
RADAR
MRI
GPS
SONAR
Which electromagnetic waves allow us to treat cancer?
Which of these is commonly called 'heat'?
Radio waves
Infrared radiation
Ultraviolet
X-rays
Gamma rays
Which of these is used in fluorescent tube?
Radio waves
Infrared radiation
Ultraviolet
X-rays
Gamma rays
What type of radiation is used to broadcast radio and television signals?
radio
x-ray
infrared
microwaves
How far away is an object if it takes 2s for a microwave signal to make a round trip after been reflected by the object?
600 000 m
300 000 km
300 m
600 km
