Formulas (Unit 2)

Question 1

Velocity of a Wave

Answer 1

v = fλ

Question 2

Snell’s Law

Answer 2

n = sin i ÷ sin r
n = speed of light in vacuum ÷ speed of light in medium

Question 3

Critical Angle

Answer 3

sin C = 1 ÷ n

Question 4

Lens Equation

Answer 4

1/u + 1/v = 1/f

Question 5

Magnification

Answer 5

m = v / u
m = hi / ho

Question 6

Power of a lens

Answer 6

P = 1 ÷ f

Question 7

Double slit experiment

Answer 7

λ = ay ÷ d

Question 8

Photo electric emmision

Answer 8

E = hf
E = hc ÷ λ

Question 9

Electron Diffraction

Answer 9

λ = h ÷ p

Question 10

Classic Doppler Effect

Answer 10

f = (v in medium ÷ (v in medium + v of source)) × fₒ
λ = (1 + (v of source ÷ v in medium)) × λₒ

Question 11

Cosmological Doppler Effect

Answer 11

z = ∆λ ÷ λ
z = ∆f ÷ f
z = v ÷ c

Question 12

Hubble’s law

Answer 12

v = Hₒd

Question 13

Age of the Universe

Answer 13

T = 1 ÷ Hₒ