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35 Cards in this Set
- Front
- Back
In a simple electric motor, a stationary magnet rotates between the poles of a fixed magnet
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False
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A generator produces electric current by rotating a magnet within the magnetic field of a second magnet
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False
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All magnets possess two poles
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True
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Primary and secondary coils are found within all electric motors
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False
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All materials exhibit the property of magnetism
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False
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If a magnet is cut in half, each piece will have only one pole
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False
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The strength of an electromagnet can be increased by increasing the number of windings in the coil
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True
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An object can be magnetic even if it is not a magnet
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True
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When an electric current flows through a wire it produces a magnetic field
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True
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Increasing the amount of current in the wire increases the strength of the electromagnet
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True
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The amplitude of a compressional wave is the distance from the top of the crest to the bottom of the trough
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False
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Waves bend around objects during destructive interference
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false
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ALL waves carry energy
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true
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the more energy a wave has the faster it travels
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false
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crests and troughs ae found on longitudinal waves
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false
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waves with longer wavelengths have higher frequency
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false
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a medium may be a solid, liquid, or gas
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true
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refraction of a wave occurs when the wave speed changes
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true
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waves combine to form a larger wave in constructive interference
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true
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microwaves are electromagnetic waves
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true
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like a sound wave, the energy of an electromagnetic wave is determined only by its amplitude
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false
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all matter produces electromagnetic waves
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true
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the cochlea is part of the ear which generates nerve impulses fromte energy of sound waves
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true
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the amplitude of a sound wave is related ot the sounds pitch
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false
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The longest wavelengths of visible light are violet
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false
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as the frequency of an electromagnetic wave ncreases so does its speed
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false
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humans can hear sound waves with a frequency of about 20 to 20 000Hz
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true
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the most dangerous of electromagnetic waves are the ultraviolet waves
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false
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the greater the intensity of a sound wave, the louder the sound
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true
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the electromagnetic waves with the greatest wavelength are gamma rays
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false
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the electromagnetic wave with the greatest amount of energy is the microwave
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false
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radio waves have wavelengths smaller than the wavelengths of visible light waves
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false
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sound waves which have a frequency of less than 20Hz are subsonic waves
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true
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electromagnetic waves are disturbances of electric and magnetic fields
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true
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Magnetic Resonance Imaging uses sound waves to create images of the internal orgns of the body
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false
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