Compliation of Formulas

Question 1

What is the formula for frequency and time period?

Answer 1

F = 1/T

F = Frequency (Hz) 
T = Time period (s)

Question 2

What is the wave equation?

Answer 2

v = f x λ

v = Wave Speed (m/s) 
f = Frequency (Hz) 
λ = Wave length (m)

Question 3

What is the diffraction grating equation?

Answer 3

nλ = dsinθ

d = slit spacing (equivalent to 1 / number of slits per m).
n = order of the image (how many bright fringes outwards)
λ = wavelength of light 
θ = the angle of diffraction of the light ray

Question 4

What is the equation of Planck’s theory?

Answer 4

E = hf (h x f)

E = Energy (J
F = Frequency (Hz)
h is Planck’s constant
h = 6.63x10-34Js)

Question 5

What is the equation that links with Excitation and De-excitation?

Answer 5

E1 – E2 = ΔE = hf

Find the difference between two energy levels and this will result the difference of energy. This equals the frequency (f) and planck’s constant (h)

E = Energy (J) 
h = Planck's constant (Js) (h = 6.63x10-34Js)
f = Frequency (Hz)

Question 6

What is the equation for the speed of waves in string instruments?

Answer 6

𝑣=√(𝑇/𝜇)

v = speed of the wave (m/s)
T = tension on the string (N)
𝜇 = mass per unit length - m/L   (kg/m)