Show:
Sound
Light
Energy transformations
Vocabulary
Try your luck!
100
Name two types of media that sound can travel through and one type of media that sound can NOT travel through.
Air, metal, water .. anything that allows sound to travel through! Can't travel through space.
100
'White' visible light is a mixture of which colors?
Red, Orange, Yellow, Green, Blue, Indigo and Violet.
100
List 4 forms of energy
Potential energy (gravitational potential, chemical potential, elastic potential) Kinetic energy (kinetic, light, sound, heat, electrical, magnetic)
100
What is a medium?
The material through which a wave travels.
100
Which part of the eye ball was the toughest to cut during the dissection? How does this relate to its function?
The cornea or sclera (depending on where you started cutting) - part of its job is to protect the eye!
200
Name the following parts of the ear: a) Is on the outside of our head and catches the sound waves from the environment? b) receives vibrations FROM the ear drum and passes them TO the anvil? c) sends the electrical signals to the brain?
a) The pinna b) the hammer c) the auditory or cochlea nerve
200
Name the parts responsible for the following fuctions: 1) Contains rods and cones that transform the light energy into electrical messages 2) Bends the light rays and focuses them onto the back of the eye ball. 3) Controls the size of the pupil
a) Retina b) Lens c) Iris
200
Describe the law of conservation of energy and what it means.
Energy can not be created or destroyed, it simply changes from one form to another. This means that energy never 'disappears' or gets made, it is always just changing the form it is in.
200
Which part of a wave does AMPLITUDE refer to?
The height of the wave. The distance from the resting position to the crest or to the trough.
200
What is the name of the jelly like substance that takes up most of the space of the eye ball?
Vitreous humor
300
Mrs Ferris asks her class to reduce the amplitude of their sound waves - what is she asking them to do?
To be quiet!
300
If I change the wavelength of visible light, what would I SEE?
A change in color of the light
300
What type of energy does an apple have?
Chemical potential energy
300
Define what refraction is.
The bending of waves as they enter a new medium at an angle and change speed.
300
Draw a CONVEX mirror with three parallel light rays hitting it. Show what happens to the light rays as they reflect off the CONVEX mirror.
You should show the three light rays reflecting and the two outside rays should move away from the center ray (they will never meet). The center ray bounces straight back.
400
Mr O'Brien hums a very low frequency note for 5 seconds, he then triples his frequency of note (keeping the amplitude the same) for the next 5 seconds. Draw a diagram of two waves.
Your two waves should both have the approximate same height. The waves should take up the same distance (to represent 5 seconds) yet the second wave should 3x the number of complete waves than the first wave.
400
If I decreased the AMPLITUDE of a visible light wave, what would I see?
The light would get dimmer (less bright)
400
Name thre energy transformations that a electric oven makes.
Electric to heat Electric to light Heat to kinetic (warm air particles move and circulate in the oven) Electric to chemical potential (if you are cooking food, the food is the chemical potential bwa ha ha ha haaaa)
400
What is the frequency of a wave?
The number of complete waves that pass a fixed point in an amount of time (for example in a second).
400
Draw a diagram of a straw in a beaker that contains water. Explain why the straw looks bent or disjointed when I look at it from an angle.
The light rays have to change media (from air, through glass of the beaker and into water). As the light rays move through the different media they slow down and appear to bend. (REFRACTION)
500
Draw a sound wave (what it ACTUALLY should be drawn as) and label the rarefactions and compressions. How would you determine or judge amplitude of this wave? Label your diagram to show one wavelength.
Your wave must show particles that are clumped together (compression) and then space between them (rarefaction). To judge amplitude you have to look at how tightly packed together the particles are in the compression area. Wavelength should be labelled from one compression to the next.
500
Draw a diagram to show how the relationship between the angle of incidence and the angle of reflection. You must label the following in your diagram: the mirror, the normal line, the incident ray, the reflected ray, the angle of incidence and the angle of reflection.
Your diagram should show: - the normal is at RIGHT ANGLES to the mirror - the angle of incidence is formed between the incident light ray and the normal (NOT between the light ray and the mirror line) - the angle of incidence and angle of reflection are equal
500
A person sky dives (jumps out of a plane with a parachute on), describe the major energy transformations that take place during the following parts of the experience: - sitting at the edge of the plane door (about to jump) - free falling after they jump from the plane - opening of the parachute and slowing down
Sitting at the plane door = gravitational potential energy turns into kinetic energy as they fall turns into heat (air resistance/friction) as they slow down due to the parachute
500
What type of wave is visible light?
Electromagnetic.
500
There are 1000J of electrical energy passing into a light bulb. The light bulb transforms the electrical energy into 200J of light and some J of heat. How many J of heat energy does the light bulb have? What law did you use to find your answer?
Law of conservation of energy - energy can not be created or destroyed. This means that there has to be 800J of heat (seeing as none of the energy can disappear).