Photons

Frequency definition

The number of waves passing a point in a second

Wavelength definition

The distance between two adjacent crests

Photons definition

Quantised pockets of wave energy

What is the relation between the energy of a photon and its frequency?

They are proportional to each other

What is the word equation linking energy, frequency and Planck's constant?

Energy (J) = Planck's constant (6.63x10^-34 Js) x frequency (Hz)

What is the symbol equation linking energy, frequency and Planck's constant?

E = h x f

What is the word equation linking frequency, speed of light and wavelength?

Frequency (Hz) = speed of light (3x10^8 ms^-1) / wavelength (m)

What is the symbol equation linking frequency, speed of light and wavelength?

f = c / λ

What is the word equation linking energy, Planck's constant, speed of light and wavelength?

Energy (J) = Planck's constant (6.63x10^-34 Js) x speed of light (3x10^8 ms^-1) / wavelength (m)

What is the symbol equation linking energy, Planck's constant, speed of light and wavelength?

E = h x c / λ

Electronvolt definition

The energy transferred (work done) to move an electron through a potential difference of 1V

What is the symbol of 1 electronvolt?

1 eV

What is the number equivalent to 1 electronvolt?

1.6x10^-19 J

What does a laser beam consist of?

Photons of the same frequency

Power of a laser beam definition

Energy per second transferred by the photons

What is the word equation to calculate the power of a laser beam?

Power (W) = number of photons x Planck's constant (6.63x10^-34 Js) x frequency (Hz)

What is the symbol equation to calculate the power of a laser beam?

P = n x h x f

List the electromagnetic spectrum in order of increasing wavelength

Gamma rays, x rays, UV light, visible light, infrared light, microwaves, radio waves