Ten questions. The result tells you which lessons you may skip.
An electron starts from rest and crosses a potential difference of \(50\,\text{V}\). Its kinetic energy is
The work function of a metal is
A photocell's current is \(32\,\mu\text{A}\). The number of electrons reaching the collector each second is
The photocurrent of a photocell becomes zero when the collector is \(1.5\,\text{V}\) below the emitter. The largest kinetic energy of the photoelectrons is
In the wave picture of light, dim light should free electrons
Light of wavelength \(400\,\text{nm}\) falls on caesium, with \(\phi = 2.14\,\text{eV}\). Take \(hc = 1240\,\text{eV nm}\). The stopping potential is
The graph of stopping potential against frequency for a metal has a slope of
Two I-V curves of a photocell meet the \(V\) axis at the same point but saturate at different currents. The two beams differ in
A source gives out \(2\,\text{W}\) of light of wavelength \(620\,\text{nm}\), whose photons carry \(3.2 \times 10^{-19}\,\text{J}\) each. It emits, each second,
A beam of power \(P\) falls straight onto a perfect mirror. The force it exerts is