According to Einstein, increasing the brightness of a beam of light without changing its color will increase:
Correct answer: A. The number of photons
- A. The number of photons
- B. The energy of each photon
- C. The speed of the photons
- D. The frequency of photons
Explanation
Einstein proposed the idea that light is quantized into discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency, as given by the equation: [E = hnu] where E is the energy of a photon, h is Planck's constant, and nu is the frequency of the light. When you increase the brightness of a beam of light, you're essentially increasing the total energy being emitted. This can be achieved by increasing the number of photons being emitted, while keeping the color (and thus the frequency) of the light constant. Therefore, option a is correct.
This question appeared on the KMU Centralized Admission Test 2022 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
Practise Dawn of Modern Physics
739 free Dawn of Modern Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Photons and the Particle Model of Light questions
If frequency of incident radiation in photoelectric effect is increased beyond threshold frequency, it will effect:
The number of ejected photoelectrons increases with increase.
In Compton scattering from stationary electrons the largest change in wavelength occurs when the photon is scattered through:
The reverse process of X ray production can be related to:
Which of the following electromagnetic radiation has photons with greatest momentum?