Chapter 15

Question 1

There are only ____ ways energy can be transferred by ______ or by _____

Answer 1

Two; particles; waves

Question 2

Need a material medium through which they can travel as they transfer energy

Answer 2

Mechanical waves

Question 3

Types of mechanical waves

Answer 3

Transverse wave
Longitudinal wave
Surface wave

Question 4

Particles vibrate at night angles to the direction of the wave

Answer 4

Transverse wave

Question 5

Particles vibrate parallel to the wave direction

Answer 5

Longitudinal wave

Question 6

Have characteristics of both transverse and longitudinal

Answer 6

Surface wave

Question 7

Single disturbance in a medium

Answer 7

Pulse

Question 8

__________ is a series of pulses at regular intervals

Answer 8

Wave train

Question 9

Need no medium through which to travel

Answer 9

Electromagnetic waves

Question 10

Horizontal distance between corresponding points on consecutive waves

Answer 10

Wavelength

Question 11

Wavelength of the wave is from _____ to _____ or ______ to _____

Answer 11

Crest to crest; trough to trough

Question 12

Number of waves that pass a given point per unit time

Answer 12

Frequency

Question 13

A frequency is measured in _____

Answer 13

Hertz

Question 14

_______ = frequency x wavelength

Answer 14

Velocity

Question 15

______ = 1 / frequency

Answer 15

Period

Question 16

Energy content of a wave depends on its ______

Answer 16

Amplitude

Question 17

The maximum displacement from the rest position

Answer 17

Amplitude

Question 18

______ of a wave depends on the _____

Answer 18

Speed; medium

Question 19

When a wave travels from one medium into another the wave is both _____ and ______

Answer 19

Reflected; transmitted

Question 20

When a wave is reflected at a more rigid medium, the reflected wave is ______

Answer 20

Inverted

Question 21

When a wave is reflected from a boundary of a medium less rigid than the one from which it came, the reflected pulse is ______

Answer 21

Erect

Question 22

When a wave transfers to a new medium the _____ stays the same but the _____ and ______ change

Answer 22

Frequency; wavelength and velocity

Question 23

At the point where two or more waves meet the displacement of the medium is the sum of the displacements of the individual waves

Answer 23

Principle of Super Position

Question 24

The effect of two or more waves traveling through a medium

Answer 24

Interference

Question 25

When two pulses combine to produce a pulse of greater amplitude

Answer 25

Constructive interference

Question 26

When two pulses combine to produce a pulse with smaller amplitude than either of the original amplitudes

Answer 26

Destructive interference

Question 27

A point in a medium that never undergoes a displacement as waves pass through each other in the medium

Answer 27

Node

Question 28

A node is caused by ______ ______ of the two waves

Answer 28

Destructive interference

Question 29

A point where the displacement caused by interfering waves is largest

Answer 29

Antinode

Question 30

Antinode is produced by ________ _______

Answer 30

Constructive interference

Question 31

Result of identical waves moving in opposite directions

Answer 31

Standing wave

Question 32

Angle at which a wave approaches a barrier is equal to the angle at which the wave is reflected

Answer 32

The Law of Reflection

Question 33

Angle between the normal and the incident ray

Answer 33

Angle of incidence

Question 34

Angle between normal and reflected ray

Answer 34

Angle of reflection

Question 35

The velocity of waves is _____ in deep water than in shallow water

Answer 35

Greater

Question 36

A decrease in the wavelength of the waves is caused by ______ ______

Answer 36

Slower velocity

Question 37

Change in direction of waves at the boundary between two different media

Answer 37

Refraction

Question 38

The bending of a wave around an object in its path

Answer 38

Diffraction