black body radiation

cutoff frequency

saturation current

Checking voltage

When Compton studied the scattering of X-rays by graphite, he found that in addition to components with the same wavelength as the incident wavelength, there were also components with wavelengths greater than the incident wavelength.

Indicates that the photon has momentum

decay of atomic nuclei

half life

binding energy

Bohr quantized the orbits. When electrons move in different orbits, the atoms are in different states and have different energies.

When an electron transitions, it will emit photons with energy hν, and the photon energy ε=hν=En-Em

Atomic radius 10^-10

J.J. Thomson studied cathode rays and discovered electrons proposed mosaic model

Rutherford's alpha particle scattering experiment discovered the atomic nucleus and proposed a nuclear structure model