In the photoelectric effect, increasing the intensity of light of a fixed frequency above the threshold frequency
Answer and explanation
Correct answer: D. increases the number of photoelectrons emitted per second
- Step 1: Intensity changes the number of photons per second, not the energy of each photon.
Answer
increases the number of photoelectrons emitted per second.
Why not the others: increases the maximum kinetic energy of each photoelectron: maximum kinetic energy depends on frequency, not intensity. decreases the work function of the metal: the work function is a property of the metal. has no effect on the emission of photoelectrons: more photons per second release more electrons per second.
Practise more Waves, light and matter.
Free questions with an explanation for every one, and full timed South Africa Matric mock tests.
More Waves, light and matter questions
- A source of sound moves towards a stationary observer. The observer detects a frequency that is
- An atom emits a line spectrum when its electrons
- A wave source vibrates with a frequency of 10 Hz. What is the period of the vibration?
- A wave has a frequency of 500 Hz and a wavelength of 0.68 m. Calculate its speed.
- A wave has a frequency of 440 Hz and a wavelength of 0.75 m. Calculate its speed.
- A wave travels at m·s⁻¹ with a wavelength of m. Calculate its frequency.