equations

• W=QV

  W=work done (J)

  Q= Charge (C)

  V= potential difference (V)
• E=mc^2

  E=Energy (J)

  m=mass (kg)

  c= speed of light (ms-1)
• I=P/A

  I= Irradiance (Watts per Square Meter)

  P= Power (W)

  A= Area (m2)
• I=k/d^2

  I=Irradiance (watts per square meter)

  k= constant

  d^2 = distance (meters)
• I1d1^2= I2d2^2

  I1 = original irradiance(watts per square meter)

  d1 = original distance (m)

  I2 = new irradiance (watts per square meter)

  d2 = new distance (m_
• E=hf

  E= Energy (J)

  h = planks constant (Js)

  f = frequency (Hz)
• Ek = hf - hf0

  Ek = kinetic energy (J)

  h= planks constant (Js)

  f= frequency (Hz)

  f0= threshold frequency (Hz)
• v=f (lambda)

  v= speed (ms-1)

  f=frequency (Hz)

  lambda = wavelength (m)
• E2 - E1 = hf

  E2 = Energy level closer to ionisation level (J)

  E1 = Energy level further from ionisation level (J)

  h= planks constant (Js)

  f = frequency (Hz)
• dsin0=m(lambda)

  d= distance between maxima

  sin0= angle

  m- maxima

  lambda = wavelength
• dsin0=(m+1/2)lambda

  d=distance between minimum

  sin0=angle

  m+1/2 = minimum

  lambda = wavelength
• E0=hf0

  E0= work function (J)

  h= planks constant (Js)

  f0= threshold frequency (Hz)
• Ek= E - E0

  Ek = kinetic energy (J)

  E= energy of photon (J)

  E0= work function (J)
• E=Nhf

  E= energy (J)

  N=number of photon

  h= planks constants (Js)

  F=frequency (Hz)
• f=N/t

  f= frequency (Hz)

  N= number of waves

  t = time(s)
• path difference

  pd
• pd=m(lambda)

  pd= path difference

  m=maxima

  lambda= wavelength
• pd=(m+1/2)lambda

  pd=path difference

  m+1/2 = minima

  lambda = wavelength (m)
• Ek= 1/2mv^2

  Ek = kinetic energy

  m=mass

  v= speed
• refractive index


  n1 = sin01/sin02
• equation for critical angle


  sinOc=1/n
• n

  refractive index
• sinOc

  critical angle
• Relationship between Energy, Number of Photons, planks constant and frequency


  E=Nhf
• Relationship between Kinetic Energy, Energy of photon and work function


  Ek=E-E0