Exploring Physics Chapter 8

Question 1

How many decibels is heavy street traffic?

Answer 1

70-80

Question 2

How many decibels is the rustling of leaves?

Answer 2

8

Question 3

How many decibels is a jack hammer?

Answer 3

90-100

Question 4

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

Answer 4

toward

Question 5

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

Answer 5

square

Question 6

The frequency of a sound is known as its

Answer 6

pitch

Question 7

The loudness of sound is measured in

Answer 7

decibels

Question 8

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

Answer 8

same speed

Question 9

The study of sound is known as

Answer 9

acoustics

Question 10

How many decibels is thunder?

Answer 10

110

Question 11

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

Answer 11

lowest

Question 12

How many decibels is an automobile

Answer 12

40-50

Question 13

How many decibels is a whisper?

Answer 13

10-20

Question 14

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

Answer 14

quality

Question 15

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

Answer 15

wavelength

Question 16

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

Answer 16

tension

Question 17

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

Answer 17

20-30

Question 18

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

Answer 18

better

Question 19

How many decibels is ordinary conversation?

Answer 19

50-60