Edexcel A-Level Physics Waves and the particle nature of light overview quiz quiz

Diffraction, the spreading of a wave around an obstacle or through a gap

Polarisation

Reflection, the bouncing of a wave back from a surface it meets

Refraction, the bending of a wave as it changes speed between media

$25$ Hz

$400$ Hz

$250$ Hz

$4000$ Hz

One wavelength

A quarter of a wavelength

Two wavelengths

Half a wavelength

Coherent (constant phase difference, same frequency)

Very bright, since only intense sources can produce a visible interference pattern

Of different colours, so that each source contributes a separate set of fringes

Placed far apart from each other, so the two sets of waves do not overlap at all

The light is fully refracted and passes straight out into the air without any reflection

Total internal reflection occurs

The light stops travelling and is completely absorbed at the boundary between the media

The refractive index of the glass changes as the angle of incidence is increased further

Decrease it

Leave it unchanged

Increase it

Make the maxima disappear

The maximum kinetic energy of the electrons

The work function

The threshold frequency

The number of electrons emitted per second

$1.8 \times 10^{-19}$ J

$8.2 \times 10^{-19}$ J

$3.2 \times 10^{-19}$ J

$5.0 \times 10^{-19}$ J

Occupy a continuous range of energies and emit light across a smooth unbroken band of colours

Occupy discrete energy levels and emit photons of fixed energy when they drop between them

Are ejected entirely from the atom each time the atom absorbs and then re-emits any light

Move at the speed of light around the nucleus, producing a fixed set of bright spectral lines

$\lambda = hp$

$\lambda = \frac{p}{h}$

$\lambda = \frac{h}{p}$

$\lambda = hf$