This is the height from the equilibrium to the crest/trough.
What is amplitude?
100
This happens when white light shines through a prism at different angels, therefore splits into a spectrum.
What is refraction?
100
Red Orange Yellow Green Blue Indigo and Violet, this is ROY G BIV
What are the colours of the visible spectrum?
100
This is the transferring of energy in the form of waves, from the longest radio wave to the shortest gamma rays.
What is electromagnetic radiation?
100
*Transverse, Longitudinal and Torsional
what are the types of vibrations?
200
What is the difference between a transverse wave and a compression wave?
The matter in the medium for the transverse wave moves up and down perpendicular to the direction that the wave travels. In a compression wave, the matter in the medium moves back and forth along the same direction that the wave travels. OR one goes up and down and the other goes “compresses” (if second answer, then must include partial first answer)
200
Why is a red apple red?
Because the red apple reflects red and absorbs all the other colours of the visible spectrum.
200
What are the three addictive primary colours?
Red, Blue and Green.
200
What are the three waves that have longer wavelengths than visible light?
Radio waves, microwaves and infrared waves.
200
A string vibrates 77, 777, 777 times over 5.206 seconds. What is the frequency? Do not round (calculators permitted)
14940026.3158 Hz
300
What are three ways of measuring the wavelength?
1. From crest to crest. 2. From through to through 3. The distance covered by one complete crest plus one complete trough.
300
Why can’t you distinguish the colour red in the dark?
Because the red object doesn’t produce its own light so it must have a source of light for the light to reflect on it. Like the sun or a light bulb.
300
List at least two ways to make white light by combining different colours.
1. Blue, green and red. 2. Cyan, yellow and magenta.
300
What are the three uses of infrared waves?
1. Remote control for television set. 2. reading CO-ROMs on a computer. 3. in heat lamps to keep food warm in fast food restaurants.
300
When a wave enters a slower medium, what happens? (hint: something to do with frequency or wavelength)
The wavelength decreases
400
How does the wave move you when you are floating in the sea? And explain.
The wave doesn’t move you forward or backward, it only moves the energy that is carried by the wave forward. The wave itself only moves up and down.
400
What is light as described by the wave model?
Light is a type of wave that travels through empty space and transfers energy from one place to another.
400
Which colour has a higher frequency, blue or green? and why.
Blue has a higher frequency because it has a shorter wavelength.
400
Who discovered X rays and what are they used for?
Wilhelm Roentgen discovered X rays in 1895. X rays are commonly used to photograph bone or teeth.
400
*The transfer of energy from one object to another having the same natural frequency. (hint: the words starts with "r" and ends with "ance"
What is resonance?
500
How do you measure the frequency of a wave? Give a question and answer it. (45 seconds maximum to make a question)
The frequency is measured in hertz. Frequency=cycles/seconds. Questions may vary.
500
How does a rainbow occur and explain.
A rainbow occurs when there are rain droplets in the air and the sun must be behind you. The rain droplets act like prisms and the sun is the white light.
500
Which colour refracts more in a prism, yellow or indigo? and why?
Indigo refracts more in a prism than yellow because indigo has a shorter wavelength. Shorter wavelength refracts more than longer wavelengths.
500
List all the waves of the electromagnetic radiation. (from shortest wavelength to longest wavelength)
Gamma rays, X rays, Ultraviolet waves, visible light, Infrared waves, Microwaves and Radio waves.
500
(match the following terms with the correct answer): the speed of sound is:
1. faster in
2. slower in
3. slowest in
A. solids
B. gases
C. liquids