Exploring Physics Chapters 8-9

Question 1

The distance along a wave, including crest and trough, is its

Answer 1

wavelength

Question 2

The frequency of a sound is known as its

Answer 2

pitch

Question 3

The ___ pitch an object can make is known as its natural or fundamental frequency.

Answer 3

lowest

Question 4

The loudness of sound is measured in

Answer 4

decibels

Question 5

If pitch increases, then source and observer must be moving ___ one another.

Answer 5

toward

Question 6

is a surface of light sensitive nerves.

Answer 6

retina

Question 7

The speed of light is ___ in water than in air.

Answer 7

slower

Question 8

How many decibels is an automobile

Answer 8

40-50

Question 9

Sunlight is a mixture of all the colors of the

Answer 9

rainbow.

Question 10

The three properties of a sound are frequency, intensity, and ___.

Answer 10

quality

Question 11

Most modern large telescopes use a ___ to collect light and bring it to a focus.

Answer 11

mirror

Question 12

How many decibels is heavy street traffic?

Answer 12

70-80

Question 13

is the opening through which light enters the eye.

Answer 13

pupil

Question 14

As sound waves spread out, they grow weaker by the ___ of the distance.

Answer 14

square

Question 15

How many decibels is the average home sounds such as the humming of a refrigerator?

Answer 15

20-30

Question 16

controls the amount of light that enters the eye.

Answer 16

iris

Question 17

High frequency, ultrasonic sounds reflect ___ from small objects than low frequency sounds.

Answer 17

better

Question 18

The pitch of a string on a stringed instrument depends on the length, thickness, and _______________ of the string.

Answer 18

tension

Question 19

The bending of the sun’s rays at sunset is an example of

Answer 19

refraction.

Question 20

The eye has cones that can detect red, green, and ___ light.

Answer 20

blue

Question 21

Sound waves travel at the ___ in air depending on their source.

Answer 21

same speed

Question 22

is sensitive to light and can distinguish color.

Answer 22

cones

Question 23

A lens thicker in the middle than at the edges is

Answer 23

convex.

Question 24

is sensitive to light but cannot see color.

Answer 24

rods

Question 25

carries information from the eye to the brain.

Answer 25

optic nerve

Question 26

How many decibels is the rustling of leaves?

Answer 26

8

Question 27

How many decibels is a jack hammer?

Answer 27

90-100

Question 28

The observation that light bounces from a mirror at the same angle at which it enters is known as the law of

Answer 28

reflection.

Question 29

How many decibels is a whisper?

Answer 29

10-20

Question 30

The image behind a flat mirror is a (A. real, B. virtual) image.

Answer 30

virtual

Question 31

adjusts light to the best focus.

Answer 31

lens

Question 32

How many decibels is ordinary conversation?

Answer 32

50-60

Question 33

The frequency of light is its

Answer 33

color.

Question 34

How many decibels is thunder?

Answer 34

110

Question 35

The study of sound is known as

Answer 35

acoustics

Question 36

brings light to a focus.

Answer 36

cornea