Phy Sci Final - Semester 2 - True/false

Front 1

In a simple electric motor, a stationary magnet rotates between the poles of a fixed magnet

Back 1

False

Front 2

A generator produces electric current by rotating a magnet within the magnetic field of a second magnet

Back 2

False

Front 3

All magnets possess two poles

Back 3

True

Front 4

Primary and secondary coils are found within all electric motors

Back 4

False

Front 5

All materials exhibit the property of magnetism

Back 5

False

Front 6

If a magnet is cut in half, each piece will have only one pole

Back 6

False

Front 7

The strength of an electromagnet can be increased by increasing the number of windings in the coil

Back 7

True

Front 8

An object can be magnetic even if it is not a magnet

Back 8

True

Front 9

When an electric current flows through a wire it produces a magnetic field

Back 9

True

Front 10

Increasing the amount of current in the wire increases the strength of the electromagnet

Back 10

True

Front 11

The amplitude of a compressional wave is the distance from the top of the crest to the bottom of the trough

Back 11

False

Front 12

Waves bend around objects during destructive interference

Back 12

false

Front 13

ALL waves carry energy

Back 13

true

Front 14

the more energy a wave has the faster it travels

Back 14

false

Front 15

crests and troughs ae found on longitudinal waves

Back 15

false

Front 16

waves with longer wavelengths have higher frequency

Back 16

false

Front 17

a medium may be a solid, liquid, or gas

Back 17

true

Front 18

refraction of a wave occurs when the wave speed changes

Back 18

true

Front 19

waves combine to form a larger wave in constructive interference

Back 19

true

Front 20

microwaves are electromagnetic waves

Back 20

true

Front 21

like a sound wave, the energy of an electromagnetic wave is determined only by its amplitude

Back 21

false

Front 22

all matter produces electromagnetic waves

Back 22

true

Front 23

the cochlea is part of the ear which generates nerve impulses fromte energy of sound waves

Back 23

true

Front 24

the amplitude of a sound wave is related ot the sounds pitch

Back 24

false

Front 25

The longest wavelengths of visible light are violet

Back 25

false

Front 26

as the frequency of an electromagnetic wave ncreases so does its speed

Back 26

false

Front 27

humans can hear sound waves with a frequency of about 20 to 20 000Hz

Back 27

true

Front 28

the most dangerous of electromagnetic waves are the ultraviolet waves

Back 28

false

Front 29

the greater the intensity of a sound wave, the louder the sound

Back 29

true

Front 30

the electromagnetic waves with the greatest wavelength are gamma rays

Back 30

false

Front 31

the electromagnetic wave with the greatest amount of energy is the microwave

Back 31

false

Front 32

radio waves have wavelengths smaller than the wavelengths of visible light waves

Back 32

false

Front 33

sound waves which have a frequency of less than 20Hz are subsonic waves

Back 33

true

Front 34

electromagnetic waves are disturbances of electric and magnetic fields

Back 34

true

Front 35

Magnetic Resonance Imaging uses sound waves to create images of the internal orgns of the body

Back 35

false