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EM Spectrum/Light

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  • The image produced by a concave lens is always...
    Smaller than the object
  • Fluorescent bulbs glow when the phosphorous coating on the inside of the tube absorbs...
    UV radiation
  • The light that we see from stars in the night sky is one type of __________ wave
    electromagnetic
  • The ________ layer blocks some of the harmful UV radiation from the sun.
    ozone
  • What is the amplitude of the node of a wave?
    zero
  • The higher the frequency of an EM wave, the more __________ it has.
    energy
  • The wavelengths of ________ are slightly longer or wider than those of visible light.
    infrared radiation
  • What is a laser?
    A concentrated beam of light that has only one frequency and does not spread out
  • When light rays bounce off a surface, it is called...
    reflection
  • Objects that partially scatter light that passes through them are called...
    translucent
  • One Hertz (Hz) is equal to what?
    The number of complete waves or cycles that pass a point each second
  • If the angle of incidence is 25 degrees, what will the angle of reflection be?
    25 degrees
  • The energy carried by an electromagnetic wave is called:
    Electromagnetic radiation
  • How are rainbows made?
    Light from the sun is refracted by water in the atmosphere
  • Why are fluorescent bulbs better than incandescent?
    Less heat, less energy, less money
  • Electromagnetic waves....
    transfer energy.
  • The visible light portion of the spectrum is found in between:
    infrared and ultraviolet
  • If light waves change speed when they pass from one medium into another, the light will be ________
    refracted
  • Why do hospitals have UV lights / blacklights by all of the doors?
    to kill bacteria
  • All of the following are parts of the EM spectrum EXCEPT...
    ultrasound
  • A material that you can see clearly through is...
    transparent
  • What is the height of a transverse wave called?
    Amplitude
  • Which color of visible light has the longest wavelengths?
    Red
  • _________ is the bending of waves around a barrier.
    Diffraction
  • Name THREE of the SIX types of waves that make up the electromagnetic spectrum.
    Radio, infrared, visible light, ultraviolet, x-ray, gamma
  • What is the "Law of Reflection"?
    The angle of the incoming wave is equal to the angle of the reflected wave.
  • In terms of waves, what are gas, liquid and solid collectively referred to?
    media or medium
  • All electromagnetic waves:
    Travel at the speed of light
  • What two properties of EM waves change from left to right on the diagram of the EM spectrum:
    frequency and wavelength
  • Light bends when it passes at an angle from air into water because the water...
    slows down the light
  • EM waves with the lowest frequencies are:
    x-rays
  • Your body gives off...
    infrared radiation
  • How can EM waves travel through space to the Earth?
    EM waves travel as transverse waves and do NOT need a medium to travel through.
  • Ultraviolet rays...
    help the body make vitamin D
  • Why are they called “electromagnet” anyway?
    There are actually 2 waves, one of the waves creates and electric field and the other wave creates a magnetic field.
  • EM waves with the longest wavelengths are...
    gamma rays
  • X-rays are best absorbed by...
    bone
  • Heat lamps give off _________ rays.
    infrared
  • What does opaque mean?
    Light is either reflected or absorbed, but does not go through
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