Yr9 Waves Flashcards Preview

Science > Yr9 Waves > Flashcards

Flashcards in Yr9 Waves Deck (19):
1

Define amplitude, frequency and pitch.

Amplitude is the maximum height of the wave measured from the zero line. Frequency is the number of waves per second. Pitch is how high or low a sound is.

2

Define sound and light.

Sound is a type of energy that travels as a longitudinal wave. Light is a type of energy that travels as a transverse wave.

3

Define transverse and longitude waves.

Transverse waves are waves that travel up and down at 90 degrees to the direction of travel(light). Longitude waves are waves that vibrate parallel to the direction to the movement(sound).

4

Define dispersal of light and refraction.

Dispersal of light is how a prism can split white into the color spectrum. Refraction is the bending of light rays as they pass from one medium to another medium (air to glass).

5

What are some everyday uses of concave mirrors and convex mirrors?

Concave mirrors are used on the headlights of cars. Convex mirrors are used on the mirrors of a cars.

6

What is the law of reflection?

The incident ray and the reflected ray lie on the same plane. The normal is perpendicular to the mirror. The incident ray is equal to the reflected ray.

7

Define wave and color spectrum.

A wave is a way to transfer energy without transferring matter. The color spectrum is all the colors that make white light.

8

Explain how sound travels through matter.

Sound waves travel through a medium such as a solid, liquid, or gas. Sound waves move by vibrating the molecules in the matter

9

Explain how light travels.

Light waves don't need any matter or material to carry its energy along. This means that light can travel through a vacuum.

10

How are shadows formed?

Shadows are formed when an opaque or translucent object blocks light.

11

How does frequency and amplitude effect the wave?

The higher the frequency, the higher the pitch. And the higher the amplitude, the higher the volume.

12

How can light be dispersed and what is the color spectrum?

An example of how light can be dispersed is using a prism. The visible color spectrum is red, orange, yellow, green, blue, indigo and violet.

13

Explain why an object looks colored in terms of reflection and absolution.

If a white light is shown on a blue object it will reflect the blue in the white light and absorb the other colors.

14

What is rarefaction and compression on longitude waves?

Rarefaction is where the wave expands (| | | |). Compression is where the wave comes together(||||)

15

What type of lens do farsighted eyes need?

Convex lens.

16

What type of lens do nearsighted eyes need?

Concave lens.

17

Where does the light focus if you have farsighted vision?

Behind the retina.

18

Where does the light focus if you have nearsighted vision?

In front of the retina.

19

Do light rays bend towards or away from the normal in denser/less denser objects?

When light rays enter a denser object the light rays bend towards the normal. When light rays enter a less denser object the light rays bend away from the normal.