Light and the electromagnetic spectrum

Question 1

refraction practical

Answer 1

1. draw around glass block on paper
2. dashed line at 90 (normal)
3. use protractor to draw incident angle
4. glass back set up ray box at incident angle + draw the ray
5. draw light from bottom connect lines
6. work out angle of refraction using protractor
7. new normal

Question 2

what happens to light when it goes into air?

Answer 2

light speeds up so move away from normal

Question 3

light can:

Answer 3

travel through a vacuum
transverse
can refract
transfers energy from 1 point to another

Question 4

sound can:

Answer 4

needs a medium
longitudinal
can refract
transfers energy from 1 point to another

Question 5

1. sound waves are collected…

Answer 5

by the ear lobe (pinna)

Question 6

2. the waves travel towards and along the..

Answer 6

ear canal

Question 7

3. the waves reach the…

Answer 7

ear drum + makes it vibrate

Question 8

4. the small bones..

Answer 8

(ossicles) amplify the vibrations

Question 9

5. the cochlea…

Answer 9

turns these into electrical signals

Question 10

6. the auditory nerve ..

Answer 10

takes signals to the brain

Question 11

what’s ultrasound

Answer 11

anything over 20kHz

Question 12

what’s infrasound

Answer 12

anything below 20Hz

Question 13

dispersion is:

Answer 13

when a white light ray is split into a spectrum of colours

Question 14

what’s total internal reflection ?

Answer 14

when light travels from a. denser material into a less dense material and all of the light is reflected

Question 15

what’s a perfect black body?

Answer 15

object that absorbs all of the electromagnetic radiation that it comes in contact with - does not transmit or reflect any radiation