set 3

Question 1

What happens with you go from glass to air? (higher to lower density)

Answer 1

When a ray of light passes from a denser material (eg water or glass) into a less dense material (eg air) it is bent towards the surface between the two materials.

Question 2

Draw a diagram that shows Light and Sound Energy
* Sound & light waves
* Change amplitude and frequency

Question 3

Refraction – what happens when you change medium?
Reflection what happens to light?

Answer 3

The wave length becomes shorter and the wave speed decreases.
The reflection process inverts each wave back-to-front, which is why a reverse image is observed.

Question 4

Draw a Sound wave

Question 5

What happens when you change amplitude and frequency?

Answer 5

The amplitude decreases with increasing frequency. The amplitude increases as the frequency decreases.

Question 6

Draw examples of both
(a. increasing frequency and b. increasing amplitude)

Question 7

What is electricity? What is Current?

Answer 7

Electricity is the flow of electrical power or charge.
Current is a flow of electrical charge carriers, usually electrons

Question 8

How does electricity work?

Answer 8

Electricity is when electrons flow or move

Question 9

What must happen for electrons to flow?

Answer 9

You need a complete circuit for electrons to flow

Question 10

What is voltage? What is resistance?

Answer 10

Voltage describes the “pressure” that pushes electricity.
Resistance slows down the flow of electrons