## Lang-Waves, sound & EM spectrum

##### Created by:

harveyg  on February 8, 2011

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# Lang-Waves, sound & EM spectrum

 A mechanical wave is caused byforces creating a disturbance in a medium
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#### Definitions

A mechanical wave is caused by forces creating a disturbance in a medium
When a wave moves across a pond, it transfers water molecules up and down and energy across the pond
A transverse wave transfers energy at right angles to the disturbance
Cheyene is using a rope to make waves. If he increases the speed with which he creates the disturbance, he will Increase the frequency of the waves
A scientist measures a wave that has a wavelength of 0.01m and a frequency of 200 waves/s. What is the wave's speed? 2 m/s
A scientist measures the height of waves compared with the surface of a calm ocean. He is finding the waves' amplitude
Dylan put one end of a stick into a pond. When he looked down at the stick, it appeared to be broken at the point where the stick entered the water. This was caused by the refractrion of the light waves passing from from air into water
Constructive interference occurs when the crests and troughs of two waves align exactly
A sound wave is produced by the vibration of an object
sound waves transfer energy by pushing air particles
In order to change the pitch of a sound, you should change its frequency
The larger the amplitude of a sound wave the more the intensity (loudness) of a sound
Unlike mechanical waves, electromagnetic waves can transfer energy through empty space
Most of the visible electromagnetic waves on Earth come from the Sun
As a mechanical wave travels, it loses energy. As an electromagnetic wave travels in a vacuum, it keeps the same energy
An EM wave is caused by the vibration of electric and magnetic fields
Which of the following shows the EM waves in order from lowest to highest frequency? infrared llight, ultraviolet light, gamma rays
The heat of a toaster is transferred by infrared light
Mckenzie looks out a window. The window is clear, or transparent. Most of the light that hits it is transmitted
An apple looks red because it reflects red light and absorbs other colors
Which type of EM waves have the lowest frequency? radio waves
Which type of EM wave has the highest frequency? gamma waves

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