Waves, Sound & Light

Question 1

Name the two waves

Answer 1

• Longitudinal (sound)

- Tranverse (radio waves)

Question 2

Define longitudinal waves

Answer 2

Source moves parallel to the direction of wave motion

Question 3

Define transverse waves

Answer 3

Source moves perpendicular to direction of wave motion

Question 4

Name the 4 properties of waves

Answer 4

• Reflection
• Refraction
• Diffraction
• Interference

Question 5

State the law of reflection

Answer 5

Angle of incidence = Angle of reflection

Question 6

State how the medium influences the waves

Answer 6

• More dense, away from normal

- Less dense, towards normal

Question 7

What is diffraction?

Answer 7

Waves bending around corners

Question 8

When does maximum diffraction take place?

Answer 8

When the gap width = wave length

Question 9

State the wave equasion

Answer 9

v = fλ

Question 10

State the “period” equasion

Answer 10

T = 1/f

Question 11

State the image properties of reflecting light in a mirror

Answer 11

• Same size
• Upright
• Virtual
• Laterally inverted
• Distance in front = distance behind

Question 12

Name a ray emerging from a prism after refraction

Answer 12

Emergent ray

Question 13

Give the formula for refractive index

Answer 13

n = sin∠i/sin∠r

Question 14

State the speed of sound in air

Answer 14

330m.s-1

Question 15

Name some uses of the doppler effect

Answer 15

• Tracking satellites
• Speed traps
• Red Shift
• Blue shift
• Detecting storms

Question 16

State the formula used to calculate stuff about the doppler effect

Answer 16

fL = ((v + vl)/(v - vs))fS

When the source is approaching, + on top.