User:Inconspicuum/Physics (A Level)/Quantum Physics Questions

Light as a Quantum Phenomenon

1. How much energy does a photon with a frequency of 50kHz carry?
2. A photon carries 10^-30J of energy. What is its frequency?
3. How many photons of frequency 545 THz does a 20W bulb give out each second?
4. In one minute, a bulb gives out a million photons of frequency 600 THz. What is the power of the bulb?
5. The photons in a beam of electromagnetic radiation carry 2.5μJ of energy each. How long should the phasors representing this radiation take to rotate?

Electron Behaviour as a Quantum Phenomenon

1. An electron moves at 30,000 ms^-1. What is its de Broglie wavelength?
2. What is its frequency?
3. What is its kinetic energy, in eV?
4. Given that it is travelling out of an electron gun, what was the potential difference between the anode and the cathode?
5. An electron is accelerated by a potential difference of 150V. What is its frequency?