PS.7 electromagnetic spectrum

What best describes the type of waves emitted by the Sun’s rays?

• The Sun’s rays are mechanical waves because they carry the greatest amount of energy.

• The Sun’s rays are electromagnetic waves because they can travel through the vacuum of space.

• The Sun’s rays are sound waves because they can travel through the vacuum of space.

• The Sun’s rays are transverse waves because they cause the particles of space to compress together and transfer motion.

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Driving on a foggy night can be difficult because the light from headlights of the car is —

• absorbed and then scattered by the particles of water in the air

• refracted and then absorbed by the particles of water in the air

• reflected and then absorbed by the particles of water in the air

• diffracted and then reflected by the particles of water in the air

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Light can sometimes be explained as a stream of tiny particles or packets of energy. These packets of energy are called—

• neutrons

• electrons

• photons

• protons

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The bending of a wave as it travels from one medium to another and as a result changes speed is called —

• 
  refraction

• inference

• diffraction

• 
  reflection

Which color of visible light has the highest frequency?

• 
  Red

• Yellow

• Violet

• Blue

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Which electromagnetic wave carries the most energy?

• Ultraviolet rays

• Gamma rays

• 
  Visible light

• 
  Radio waves

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The bending of a wave around the edge of a barrier is called—

• diffraction

• interference

• 
  refraction

• reflection

Radio detection and ranging is better known by the nickname—

• AM radio

• radar

• radio transmissions

• FM radio

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Which electromagnetic wave is used to diagnose and treat cancer?

• Gamma rays

• Ultraviolet rays

• Infrared rays

• 
  X-rays

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A pencil is placed in a beaker of water. When viewed from the side, the pencil appears to be bent. This is an example of —

• 
  attraction

• 
  refraction

• reflection

• 
  diffraction

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