Questions for Quantum Physics And Lasers (JC) Set 1

Which of the following scenarios about the de Broglie wavelength of an object is not possible?

  1. A 100 m sprinter has a wavelength of about 10-36 m.
  2. A stationary electron has wavelength of infinite length.
  3. An elephant with an associated wavelength equals zero.
  4. A Sumo wrestler has wavelength smaller than a child when both moves with the same speed.
Click To show/hide answer

λ = h / mv
For option 3, Zero wavelength means its speed is infinite – not possible.

Answer: 3

In the production of laser, a two-level system is not preferred because

  1. there are not many elements with only two level system.
  2. too many atoms will remain in the excited state for long duration.
  3. the energy difference between the two levels is too little for photons to be emitted.
  4. population inversion will not be possible as atoms arrive in the excited level at the same rate as they leave.
Click To show/hide answer

Explanation found here:
Answer: 4

Back To Quantum Physics And Lasers

Back To A Level Physics Topic List

Mini Physics

As the Administrator of Mini Physics, I possess a BSc. (Hons) in Physics. I am committed to ensuring the accuracy and quality of the content on this site. If you encounter any inaccuracies or have suggestions for enhancements, I encourage you to contact us. Your support and feedback are invaluable to us. If you appreciate the resources available on this site, kindly consider recommending Mini Physics to your friends. Together, we can foster a community passionate about Physics and continuous learning.

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.