EJU Japan · EJU Physics

Atoms and Light

8 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 8 questions

  1. A photon has frequency 7.5 Hz. Using J s, what is its energy?
  2. A photon has frequency 6 Hz. Using J s, what is its energy?
  3. A photon has frequency 10 Hz. Using J s, what is its energy?
  4. A radioactive sample contains 1280 g of nuclide with a half-life of 8 hours. How much remains after 40 hours?
  5. A radioactive sample contains 1600 g of nuclide with a half-life of 12 hours. How much remains after 36 hours?
  6. A radioactive sample contains 640 g of nuclide with a half-life of 5 hours. How much remains after 25 hours?
  7. The photoelectric effect shows that light behaves as
  8. Increasing the intensity of light above the threshold frequency in the photoelectric effect increases

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