Physics Test 1

Question 1

What is the wavelength?

Answer 1

It is the distance from one place in a wave to the next similar place in a wave.

Question 2

What is the amplitude?

Answer 2

Is the wave height from the rest position of the wave (where there is no wave) to the crest or the wave depth from the rest to trough.

Question 3

What is the frequency?

Answer 3

It is the rate of repetition of a wave measured in Hz (cycles per second
).

Question 4

What is crest and trough?

Answer 4

Crest is the highest point in the wave, trough is the lowest.

Question 5

Transverse Waves?

Answer 5

water waves

Question 6

Longitudinal waves?

Answer 6

sound waves

Question 7

Order of ER spectrum? from lowest frequency

Answer 7

Radio, Microwave, Infared, Visible, Ultra violet, X-ray, gamma

Question 8

What is Incandescent Light?

Answer 8

Light produced from very high temp, wire FILAMENT and heats up when current flows and produces light.

Question 9

What is Fluorescent Light?

Answer 9

A bulb is filled with mercury vapour, inside is coated with phosphor power , current passes through, mercury gets excited, strikes phosphor and emits UV light.

Question 10

What is Phosphorescent Light?

Answer 10

Stores up energy of light and emits slowly overtime.

ex. glow in the dark toys

Question 11

What is Chemiluminescence?

Answer 11

Light produced from a chemical reaction without rise in temp.

Bioluminescence is a kind of this (from plants or animals like jelly fish, etc)

ex. glow sticks

Question 12

What is Triboluminescence?

Answer 12

Produces light from friction

ex. some crystals

Question 13

What is Electric Discharge?

Answer 13

Produces light when electric current passes through air or another gas

ex. lightning and neon signs

Question 14

What is LED?

Answer 14

Light source made out of semi conductor (small amount of energy)

ex. black light on phone

Question 15

What is OLED?

Answer 15

Word to remember: organic

Question 16

What is LCD?

Answer 16

Word to remember: liquid Crystal

Question 17

What is plasma?

Answer 17

Word to remember fluorescents

Question 18

Real and virtual images?

Answer 18

Virtual images form when light rays from the same location on an object reflect off a mirror and diverge or spread apart. Real images form when light rays from the same location on an object reflect off a mirror and converge or come together.

Question 19

What is the normal?

Answer 19

An imaginary line perpendicular to the mirror.

Question 20

What is Focal Point?

Answer 20

Where all rays will eventually meet.

Question 21

What is the Vertex?

Answer 21

The middle point of a curved mirror.

Question 22

What is the Principal Axis?

Answer 22

An imaginary line drawn through the vertex, perpendicular to the mirror

Question 23

What is the Focal Length?

Answer 23

Distance from vertex to focal point.

Question 24

What is the Centre of Curvature?

Answer 24

Where all the normals meet.

Question 25

Concave mirrors

Answer 25

• backwards C
• converging mirror, all the rays meet at focal point

Question 26

Convex mirrors

Answer 26

• C
• diverging mirror, doesn’t collect rays, they spread apart

Question 27

Regular Reflection

Answer 27

It is a straight line (mirror) and the rays hit the straight line and reflect into your eyes.

Question 28

Difuse Reflection

Answer 28

It is a wavy line (water) and the rays hit it and bounce off in different directions causing no image.

Question 29

Examples of Concave and Convex mirrors.

Answer 29

Concave:
- Headlights
- Makeup mirror

Convex:
- Security mirror
- Side-view mirror.

Question 30

What is the Umbra?

Answer 30

Light source is blocked.

Question 31

What is the Penumbra?

Answer 31

Partical shadow from non-point light.