Unit 3 Review

An old movie poster used a quote "In space, no one can hear you scream!" Why is this true or not true?

• The quote is incorrect, you can hear sound in outer space.
• Sound cannot be polarized. So, you cannot hear sound in space.
• Sound is an electromagnetic wave and needs no medium to travel through.
• Sound needs a medium for the wave to vibrate and there is nothing in space to vibrate.

Why does light behave as shown in the image when it passes from air to glass?

• Light is scattered on the surface of the glass.
• Light slows down when it passes into a denser medium.
• Light is partially reflected on the surface of the glass.
• Light splits into its constituent colors when it passes through glass.

What happens when light strikes an opaque object?

• All of the light passes through the object.
  
• All of the light is reflected by the object.
  
• None of the light passes through the object.
  
• Some of the light passes through and some of the light is absorbed or scattered by the object.

The earth receives energy from the sun. You feel the energy on your skin every time you go outside on a sunny day. Which form of energy causes you to get a sun burn if you stay in the sun too long?

• visible 
• gamma rays
• ultraviolet
• radio waves

The method of heat transfer by which the sun warms the earth is

• conduction
• convection
• radiation
• solaration

Which type of wave would actually slow down when moving from the air into the ocean?

• Sound Waves
• Light Waves
• Earthquake Waves
• Ocean Surface Waves

You see lightning before you hear thunder because

• light waves can travel through a vacuum.
• sound waves cannot travel through the air.
  
• light waves travel faster than sound waves.
  
• sound waves travel faster than light waves.

Which object is visible only by reflection?

• the Sun
• Earth's moon
• a candle flame
• a bolt of lightning

Which of these waves can NOT travel through the vacuum of space?

• microwaves
• radio waves
• light waves
• sound waves

One part of the electromagnetic spectrum that arrives on Earth as solar radiation from the Sun is the visible spectrum. Wavelengths of the visible spectrum combine to form what we refer to as

• day light.
  
• white light.
  
• shortwave radiation.
  
• ultraviolet radiation.