Waves

Question 1

work

Answer 1

force*distance

Question 2

joule

Answer 2

newtons * meters

Question 3

power

Answer 3

energy/time or work done divided by given time

Question 4

Kinetic energy

Answer 4

energy due to speed or movement

Question 5

Potential energy

Answer 5

stored energy

Question 6

Amplitude

Answer 6

maximum distance from equilibrium. height of wave.

Question 7

frequency

Answer 7

how often waves are made and number of waves

Question 8

wavelength

Answer 8

length of wave from crest to crest or trough to trough

Question 9

transverse wave

Answer 9

wave on a string

Question 10

longitudal wave

Answer 10

sound wave or push wave

Question 11

wave speed

Answer 11

frequency*wavelength

Question 12

Like a transverse wave, a longitudinal wave has

Answer 12

amplitude, frequency, wavelength, and speed.

Question 13

The vibrations of a transverse wave move in a direction

Answer 13

at right angles to the direction of wave travel.

Question 14

The vibrations of a longitudinal wave move in a direction

Answer 14

along the direction of wave travel.

Question 15

An object that completes 10 vibrations in 20 seconds has a frequency of

Answer 15

0.5 hertz

Question 16

If the frequency of a certain wave is 10 hertz, its period is

Answer 16

0.1 seconds

Question 17

A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave’s frequency?

Answer 17

2 hertz

Question 18

The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is

Answer 18

2 m.

Question 19

On some days, air nearest the ground is colder than air that is higher up. On one of these days, sound waves

Answer 19

tend to be refracted downward.

Question 20

True or false: Sound waves can interfere with one another so that no sound results.

Answer 20

True

Question 21

The object with the highest natural frequency is a

Answer 21

small bell.

Question 22

Sound will be louder if a struck tuning fork is held

Answer 22

with its base against a tabletop.

Question 23

A base fiddle is louder than a harp because of its

Answer 23

sounding board

Question 24

Sound waves cannot travel in

Answer 24

a vacuum.

Question 25

Compressions and rarefactions are characteristic of

Answer 25

longitudinal waves.

Question 26

Most of the waves in the electromagnetic spectrum are

Answer 26

invisible

Question 27

Radio waves travel

Answer 27

always much faster than sound waves.

Question 28

Which electromagnetic waves have the longest wavelength?

Answer 28

radio waves

Question 29

Sunburns are produced by

Answer 29

ultraviolet light

Question 29

Which color of light gets through red glass?

Answer 29

red

Question 30

The fact that you can see stars in the nighttime sky is evidence that

Answer 30

light can travel in a vacuum and our atmosphere is transparent to visible light.

Question 31

Compared to its average speed in air, the average speed of a beam of light in glass is

Answer 31

less.

Question 32

Compared to the photon that enters a pane of window glass, the photon that emerges is

Answer 32

an identical but different photon.

Question 33

Glass is transparent to

Answer 33

visible light.

Question 34

Materials generally become warmer when light is

Answer 34

absorbed by them

Question 35

The sensation of color is seen when light falls on the eye's

Answer 35

cones

Question 36

The physics underlying the redness of sunsets and the color of blue jays involves

Answer 36

scattered sunlight.

Question 37

Light is reflected when

Answer 37

incident light is returned into the medium from which it came.

Question 38

The type of lens that spreads parallel light is a

Answer 38

diverging lens

Question 39

Refraction occurs when light passing from one medium to another

Answer 39

changes speed

Question 40

The type of lens that brings parallel light rays together is a

Answer 40

converging lens

Question 40

What types of light have sufficient energy to break bonds?

Answer 40

gamma rays, x-rays, UV

Question 41

UV

Answer 41

ultraviolet, breaks bonds

Question 42

IR

Answer 42

infrared, makes molecules vibrate

Question 43

microwaves

Answer 43

make molecules spin

Question 44

The fundamental force underlying all chemical reactions is

Answer 44

electrical

Question 44

The fundamental force underlying all chemical reactions is

Answer 44

electrical

Question 45

A fundamental rule of electricity is that

Answer 45

like kinds of charges repel and unlike kinds of charges attract

Question 46

An electron and a proton

Answer 46

attract each other

Question 47

The vast numbers of electrons in a coin don't fly off the surface because

Answer 47

they are attracted by an equal number of protons

Question 48

The pair of protons in the nucleus of a helium atom

Answer 48

attract a pair of orbiting electrons.

Question 49

neutrons

Answer 49

do not have an electrical charge

Question 50

To say that electric charge is conserved means that no case has ever been found where

Answer 50

net charge has been created or destroyed

Question 51

To become a negative ion, an atom must

Answer 51

gain an electron

Question 52

To become a positive ion, an atom must

Answer 52

lose an electron

Question 52

Two protons attract each other gravitationally and repel each other electrically. The stronger of these two forces is

Answer 52

electrical

Question 53

Conducting materials are composed of atoms with

Answer 53

loose outer electrons

Question 54

Insulating materials are composed of atoms with

Answer 54

tightly bound outer electrons

Question 55

Rub electrons from your hair with a comb and the comb becomes

Answer 55

negatively charged

Question 56

A negatively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomes

Answer 56

positively charged

Question 57

A balloon will stick to a wooden wall if the balloon is charged

Answer 57

positively or negatively.

Question 58

Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs

Answer 58

voltage

Question 59

Current in a conductor can be increased by

Answer 59

reducing its resistance or increasing the voltage across it.

Question 60

In units of measurement, power in watts is equal to

Answer 60

amperes*volts

Question 61

In a circuit powered by a battery, charge

Answer 61

is energized by and flows through the battery

Question 62

Conductors

Answer 62

carries electricity (metals, salt water)

Question 63

insulators

Answer 63

stops electricity (most nonmetals, most plastics)

Question 64

medium

Answer 64

what waves use to travel through, sound uses air. light doesn't need a medium

Question 65

primary colors in light

Answer 65

red, blue, green

Question 66

electricity

Answer 66

charge that's moving

Question 67

Which of the following are true for most conductors?

Answer 67

Electrons are shared in a "sea" of electrons and are free to move.

Question 68

ion

Answer 68

charged particle

Question 69

a charge on an insulator

Answer 69

stays where its put

Question 70

US voltage

Answer 70

110-120 voltage

Question 71

batteries

Answer 71

make potential energy

Question 72

watts

Answer 72

power in a system

Question 73

volts

Answer 73

pressure against electrons in a systems

Question 74

ohm

Answer 74

resistance

Question 75

current

Answer 75

how many electrons move through a system in a time period.

Question 76

ohm's law

Answer 76

current=voltage/resistance

Question 77

equation for watts

Answer 77

volts*amps