Electromagnetic Spectrum Test UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Electromagnetic waves - CORRECT ANSWER Transverse waves that have some
electrical properties and some magnetic properties. Consists of changing electric and magnetic
fields.
Electromagnetic radiation - CORRECT ANSWER The energy that is transferred by
electromagnetic waves. This does not need a medium to travel in.
What's the speed of electromagnetic waves? - CORRECT ANSWER All travel at about
300,000,000 meters/300,000 km in a vacuum. Light from the sun travels the 150 million
kilometers to Earth in 8 minutes. Waves travel more slowly through through the atmosphere or
glass, but they're still about a million times faster than sound can travel in air.
Light - CORRECT ANSWER Has many properties of waves and can also act as though it
is a stream of particles.
Polarizing filter - CORRECT ANSWER Acts as though it has either horizontal or vertical
tiny slits. if you place one on top of another the amount of light that comes through changes... If
two filters are placed so one is rotated 90 degrees from the other, no light can come through
because all of it is blocked.
Polarized light - CORRECT ANSWER The light that passes through a polarizing filter. It
has the property of a wave. When light enters, only some waves can pass through. Waves that
vibrate up and down can pass through vertical slits; waves that vibrate left and right can pass
through horizontal slits.
Photoelectric effect - CORRECT ANSWER When a beam of light shines on some
substances and causes electrons to move, which causes an electric current to flow, or even knock
electrons out of the substance.
, Photon - CORRECT ANSWER Each packet of a stream of tiny packets/particles. The idea
of light as a stream of tiny packets or particles of energy.
Visible light - CORRECT ANSWER Radiation in the wavelengths that your eyes can see.
Only a small portion of electromagnetic radiation is this. The rest are invisible.
Equation for speed - CORRECT ANSWER Speed = wavelength x frequency (Higher
frequency = higher energy)
Electromagnetic spectrum - CORRECT ANSWER The name for the range of
electromagnetic waves when they're placed in order of increasing frequency. It's made up of 6
waves: radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays.
(RIVUXD)
Radio waves - CORRECT ANSWER Longest wavelengths, lowest frequencies. Most we
received have traveled through air. Antennas pick up radio waves from the air and send them
through wires to your radio. The radio converts electromagnetic waves into the sound that comes
out of the radio speakers. The number on the radio tells the frequency of that station.
Microwaves - CORRECT ANSWER Radio waves with the shortest wavelengths and the
highest frequencies. When you turn on a microwave oven, it gives off electromagnetic waves
that bounce inside and that penetrates the food, which water molecules inside the food absorb,
which results in the food to get hot. They can pass through glass and plastic. Metals reflect
microwaves. Microwaves aren't easily blocked by trees, buildings, and mountains. So they're
used to transmit cell phone calls.
Radar - CORRECT ANSWER Short-wavelength microwaves are used in this, and can be
used to locate objects. It stands for radio detection and ranging. A radar device sends out small
pulses of radio waves, which are reflected back by objects that they strike. A receiver detects
these and measures the time it takes for them to come back. A radar gun sends blips of radio
waves towards a moving car, which are then reflected. It uses the difference in frequency to
calculate the speed. It's also used at some sport events.
ACTUAL Exam Questions and CORRECT
Answers
Electromagnetic waves - CORRECT ANSWER Transverse waves that have some
electrical properties and some magnetic properties. Consists of changing electric and magnetic
fields.
Electromagnetic radiation - CORRECT ANSWER The energy that is transferred by
electromagnetic waves. This does not need a medium to travel in.
What's the speed of electromagnetic waves? - CORRECT ANSWER All travel at about
300,000,000 meters/300,000 km in a vacuum. Light from the sun travels the 150 million
kilometers to Earth in 8 minutes. Waves travel more slowly through through the atmosphere or
glass, but they're still about a million times faster than sound can travel in air.
Light - CORRECT ANSWER Has many properties of waves and can also act as though it
is a stream of particles.
Polarizing filter - CORRECT ANSWER Acts as though it has either horizontal or vertical
tiny slits. if you place one on top of another the amount of light that comes through changes... If
two filters are placed so one is rotated 90 degrees from the other, no light can come through
because all of it is blocked.
Polarized light - CORRECT ANSWER The light that passes through a polarizing filter. It
has the property of a wave. When light enters, only some waves can pass through. Waves that
vibrate up and down can pass through vertical slits; waves that vibrate left and right can pass
through horizontal slits.
Photoelectric effect - CORRECT ANSWER When a beam of light shines on some
substances and causes electrons to move, which causes an electric current to flow, or even knock
electrons out of the substance.
, Photon - CORRECT ANSWER Each packet of a stream of tiny packets/particles. The idea
of light as a stream of tiny packets or particles of energy.
Visible light - CORRECT ANSWER Radiation in the wavelengths that your eyes can see.
Only a small portion of electromagnetic radiation is this. The rest are invisible.
Equation for speed - CORRECT ANSWER Speed = wavelength x frequency (Higher
frequency = higher energy)
Electromagnetic spectrum - CORRECT ANSWER The name for the range of
electromagnetic waves when they're placed in order of increasing frequency. It's made up of 6
waves: radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays.
(RIVUXD)
Radio waves - CORRECT ANSWER Longest wavelengths, lowest frequencies. Most we
received have traveled through air. Antennas pick up radio waves from the air and send them
through wires to your radio. The radio converts electromagnetic waves into the sound that comes
out of the radio speakers. The number on the radio tells the frequency of that station.
Microwaves - CORRECT ANSWER Radio waves with the shortest wavelengths and the
highest frequencies. When you turn on a microwave oven, it gives off electromagnetic waves
that bounce inside and that penetrates the food, which water molecules inside the food absorb,
which results in the food to get hot. They can pass through glass and plastic. Metals reflect
microwaves. Microwaves aren't easily blocked by trees, buildings, and mountains. So they're
used to transmit cell phone calls.
Radar - CORRECT ANSWER Short-wavelength microwaves are used in this, and can be
used to locate objects. It stands for radio detection and ranging. A radar device sends out small
pulses of radio waves, which are reflected back by objects that they strike. A receiver detects
these and measures the time it takes for them to come back. A radar gun sends blips of radio
waves towards a moving car, which are then reflected. It uses the difference in frequency to
calculate the speed. It's also used at some sport events.
