physics

posted by .

Please could someone advise me on answering this question. I need to explain why when infrared radiation falls on fluorescent material no visble light is emitted. Is this something to do with infrared being at the lower energy end of the spectrum?
I would be very grateful for some help as I'm struggling with it.

Yes, it has to do with the fact that infrared radiation has a lower frequency than ordinary light.

Light consists of photons which have an ergy of h f, where h is Planck's constant and f the frequency. Atoms and molecules can exist in different energy states. If a photon has an energy equal to the energy difference of two energy states, then it can be absorbed by the molecule. After some time, the molecule will fall back to the ground state and emit a photon.

The molecule can make a transition back to the ground state via intermediary states. Tghis means that the emitted photons will have lower energy and thus lower frequencies than the original photon.

This means that if infrared radiation is used to cause fluorescence, then the emiited radiation will be in the infrared.

Thank you kind sir. TYhis is a great help.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.
  2. Science

    in the process called Fluorescence, some substances absorb photons of one kind of radiation, and give out photons of a different kind. When infrared radiation falls on these materials, visable light is not emitted. Why not?
  3. science

    In the process called fluorescence, some substances absorb photons of one kind of radiation (e.g) ultraviolet radiation), and give out photons of a different kind (e.g visible light). When infrared radiation falls on these materials, …
  4. Quantum Physics

    How is it a substance can emit photons of visible light after absorbing ultra violet photons but not with infrared radiation The re-emitted photons must be of lessor energy (longer wavelength) than the incident photons. In a one-photon …
  5. physics-heat transfer

    consider a brick wall that has been exposed to the sun for some time. 1.how did the heat get from the sun's surface to the wall?
  6. chemistry

    Infrared, ultraviolet, and visible radiation are all part of the electromagnetic spectrum. Arrange the three types of radiation in order of increasing energy?
  7. college physics

    A typical wavelength of infrared radiation emitted by your body is 25 ┬Ám (2.5 multiplied by 10-5 m). What is the energy per photon of such radiation?
  8. physics

    If you are sitting at home in your room, the walls please help me pick one best answer of the followings. 1. emit visible light with a peak wavelength close to 0.5 micrometer. 2. emit thermal radiation in the near infrared with a peak …
  9. college physics

    If you are sitting at home in your room, the walls 1. emit visible light with a peak wavelength close to 0.5 micrometer. 2. emit thermal radiation in the near infrared with a peak wavelength close to 1 micrometer. 3. emit thermal radiation …
  10. physics

    a) What is the frequency of a photon of UV radiation ( = 2.00 x 10^-7 m)?

More Similar Questions