light and sound

Question 1

Light is:

Answer 1

• A transverse wave

- can be reflected and refracted

Question 2

Investigate refractive index

Answer 2

1. Shine light ray through the glass block
2. Use crosses to mark the path of the ray
3. Join up crosses with a ruler
4. Draw on a normal where the ray enters the glass block
5. Measure the angle of incidence and angle of refraction.
6. Repeat for different angles, plot on table, calculate refractive index and find avg.

Question 3

TIR

Answer 3

• I > c

- used to transmit signals along optical fibres

Question 4

Sound waves

Answer 4

• are longitudinal waves which can be reflected and refracted

Question 5

Hertz

Answer 5

• humans hear 20-20k hz

Question 6

Oscilloscope and mic displays sound waves

Answer 6

• plug mic into oscilloscope
• sound will transfer into an electrical signal which the oscilloscope can display
  → greater amplitude = more energy
  → more energy = louder
• frequency low means pitch low + vice versa