What is the mass of an electron?
- 1 u
What unit is used to measure the energy of an electron?
Thermionic emission is the emission of electrons from the surface of a hot metal.
What is the work function of a metal?
The minimum energy needed to remove an electron from the surface of a metal.
The maximum limit for energy needed to remove an electron from the surface of a metal.
The minimum frequency required to produce photoelectric emission
What phenomenon is the cathode ray tube based on?
X-rays are electromagnetic radiation of extremely long wavelength.
Which of the following is not a component of an X-ray tube?
Cathode & anode
Calculate the energy of a photon of light of frequency 8 x 10^14
Planck's constant = 6.6 x 10^-34 J s
5.28 × 10^-19
1.21 x 10^48
5.28 × 10^19
What is the charge of a proton?
In a cathode ray tube, where does thermionic emission occur?
At the cathode
At the anode
Along the filament
Across the fluorescent screen