BRAINCAKEExam Question 1
Question
A laser pointer emits green light of wavelength 500 nm. Its output power is 1.0 mW.
(a) Calculate the frequency of the light. (1)
(b) Calculate the energy of one photon, in joules and in electronvolts. (3)
(c) Calculate the number of photons emitted by the laser each second. (2)
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Key terms in this lesson
- electronvolt
- The energy transferred when an electron moves through a potential difference of one volt.
More in Quantum Physics
- Electron Microscopes
- Electron Energy Levels
- Excitation and De-excitation
- Line Spectra
- Exam Question 2
- Exam Question 3
- Exam Question 4
- Exam Question 5
All 21 lessons in Quantum Physics · All Edexcel AS-level Physics topics