waves science 8th grade

Question 1

_ waves REQUIRE a medium.

Answer 1

Mechanical

Question 2

_ waves DO NOT REQUIRE a medium, but may use one.

Answer 2

Electromagnetic

Question 3

_ Waves move parallel

Answer 3

Longitudinal

Question 4

_ waves move perpendicular

Answer 4

Transverse

Question 5

Frequency:

Answer 5

The number of wave cycles per second. Measured in Hz

Question 6

Reflection of a wave:

Answer 6

the change of direction of propagation of a wave when it meets a boundary.

Question 7

The angle of incidence:

Answer 7

The angle between the incident ray and a line normal to the surface at the point where the light strikes.

Question 8

The angle of reflection:

Answer 8

The angle between the reflected ray and the normal ray

Question 9

When sound waves are reflected, they create a

Answer 9

echoe

Question 10

Refraction:

Answer 10

The bending as it passes through one medium to another

Question 11

Interference:

Answer 11

When two or more waves meet at the same point in a medium and momentarily combine to form a single wave.

Question 12

Constructive interference

Answer 12

Combined curves

Question 13

deconstructive interference

Answer 13

forms full circle

Question 14

What type of wave is a sound wave?

Answer 14

Mechanical

Question 15

what type of wave is a light wave?

Answer 15

Electromagnetic

Question 16

What two factors affect the speed of a wave?

Answer 16

The type of wave itself, and the medium

Question 17

What is the doppler effect?

Answer 17

e increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other.

Question 18

How is pitch related to wave length?

Answer 18

Pitch lasts as the wavelength widens

Question 19

How is frequency related to wavelength?

Answer 19

Higher frequency, the shorter the wavelength

Question 20

How is pitch related to frequency of a wave

Answer 20

The higher the frequency, the higher the pitch.

Question 21

What does Amplitude measure?

Answer 21

The amount of energy carried by a sound wave

Question 22

Reflection:

Answer 22

occurs when light traveling through one material bounces off a different material.

Question 23

Refraction:

Answer 23

he change in the direction of a wave passing from one medium to another.

Question 24

Diffraction:

Answer 24

Waves bend around a barrier or edges of an opening

Question 25

Rarefaction:

Answer 25

A decrease in density and pressure in a medium, such as air, especially when caused by the passage of a wave, such as a sound wave.

Question 26

Absorption:

Answer 26

a substance captures and transforms energy

Question 27

Resonance

Answer 27

he occurrence of a vibrating object causing another object to vibrate a higher amplitude

Question 28

Law of reflection:

Answer 28

when the light rays fall on the smooth surface, the angle of reflection is equal to the angle of incidence, also the incident ray, the reflected ray, and the normal to the surface all lie in the same plane.

Question 29

What is an angle of incidence?

Answer 29

the angle between a ray incident on a surface and the line perpendicular (at 90 degree angle)