Wave Motion

Question 1

speed of light

Answer 1

3 x10^8

Question 2

EM Waves

Answer 2

R M I V U X G

Question 3

Visible light λ

Answer 3

400nm-700nm

Question 4

microvaves

Answer 4

-mm -cm

Question 5

radio waves

Answer 5

1m

Question 6

gamma ray

Answer 6

10^-15

Question 7

x ray

Answer 7

10^-10

Question 8

transverse waves

Answer 8

points of disturbance oscillate about their equilibrium positions perpendicular to the direction of wave motion/ energy propagation

Question 9

longitudinal waves

Answer 9

points of disturbance oscillate about their equilibrium positions along the direction of wave motion/ energy propagation

Question 10

Intensity∝

Answer 10

I ∝ Amplitude²

I ∝ 1/r² (r is distance from the wave source to the point the intensity is measured)

Question 11

all transverse waves can be

Answer 11

polarised

Question 12

Malus’ Law

Answer 12

Intensity ∝ cos²θ

I=I₀cos²θ

Question 13

phase diff

Answer 13

ΔΦ/2π = Δx/Δλ , ΔΦ/2π = Δt/ΔT

Question 14

polarisers with // polarising axes passes ?% of light?

Answer 14

100%

Question 15

polarisers with ⊥ polarising axes passes ?% of light?

Answer 15

0%

Question 16

polarisers with θ ≠0° ≠90° polarising axes passes ?% of light?

Answer 16

50%

Question 17

polarisation

Answer 17

a phenomenon whereby vibrations in a transverse wave are restricted to only one direction in the plane normal to the direction of energy transfer

Question 18

Wave intensity formula & unit

Answer 18

Power/Area (Area=4πr² for spherical wave sources)

Wm-2

Question 19

relationship btw A&r

Answer 19

I ∝ Amplitude²
I ∝ 1/r²
so A ∝ 1/r

Question 20

identify rarefaction from a dist-position graph

Answer 20

the point that has +ve grad & lies on the x-axis

Question 21

identify compression from a dist-position graph

Answer 21

the point that has -ve grad & lies on the x-axis

Question 22

v=

Answer 22

v=fλ