# Electromagnetic Waves

## Quiz by sara

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10 questions
• Q1
Define electromagnetic waves
are waves that are created as a result of vibrations caused by magnetic field.
are waves that are created as a result of vibrations between an electric force and a magnetic force.
are waves that are created as a result of vibrations caused by electric field .
are waves that are created as a result of vibrations between an electric field and a magnetic field.
30s
• Q2
uses of microwaves
medical imaging
all of the above
cellular phones
cancer treatment
20s
• Q3
How does the speed at which electromagnetic waves propagate through different materials vary?
equals to the wave’s speed in a vacuum
none of the above
always more than the wave’s speed in a vacuum
always less than the wave’s speed in a vacuum
30s
• Q4
Which of the following correctly lists electromagnetic waves in order from longest to shortest wavelength?
television, infrared, visible light, X-rays
microwaves, ultraviolet, visible light, gamma rays
radio waves, infrared, gamma rays, ultraviolet
gamma rays, ultraviolet, infrared, microwaves
30s
• Q5
Define electromagnetic spectrum
The range of frequencies and wavelengths that make up all forms of electromagnetic radiation
waves that are created as a result of vibrations between an electric field and a magnetic field
The range of frequencies and wavelengths that make up no forms of electromagnetic radiation
30s
• Q6
When does quarts crystals deform?
When velocity applied across them
When a potential difference is applied across them.
30s
• Q7
The size of the resonant cavity determine the frequency of Oscillation?
False
True
30s
• Q8
Waves with how much frequencies are produced using a resonant cavity?
Less then 100HMZ
greater than100HMZ
greater than 400HMZ
Less than 400HMZ
30s
• Q9
The ———————of the resonant cavity determines the frequency of Oscillation
Color
Size
Shape
volume
10s
• Q10
The accelesatiom is largest when the antenna is opposite to the direction of the wave's electric field
False
True
10s

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