Physics

Explain how the photoelectric effect is used to open automatic dooes when someone approaches.

  1. 👍 0
  2. 👎 0
  3. 👁 160
asked by Dallas
  1. I tried to find a web site but the only ones I found were commercial companies hawking their wares. There are several kinds of automatic doors. The one with which I am familiar works because a light beam shines on a receiver that is connected to an electronic circuit. When the beam is broken (by someone walking up to the door), the electronic circuit is activated and the door is opened.

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  2. Photo electric effect related to automatic doors how it operate

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    apply quantum theory to explain the photoelectric effect

    asked by Anonymous on December 2, 2010
  2. Chemistry

    Please explain what is the photoelectric effect and how light has particle-like properties? I do not understand.

    asked by Tatiyana on November 3, 2017
  3. english

    I'm having trouble paraphrasing this: Einstein used his light-quantum hypothesis to explain another important puzzle, the photoelectric effect. Can you help?

    asked by Anonymous on May 11, 2008
  4. Math

    Which describes the end behavior of the graph of the function f(x)=-2x^3-5x^2+x? a. f(x) approaches infinity as x approaches negative infinity and f(x) approaches infinity as x approaches infinity b. f(x) approaches negative

    asked by Girly Girl on October 29, 2017
  5. Economics

    Give an example of a government policy that acts as an automatic stabilizer. Explain why the policy has this effect.

    asked by Emilie on October 27, 2018
  6. science

    Define the photoelectric effect?

    asked by niraj on February 2, 2017
  7. physics ---- really dnt get this at all

    Will the photoelectric effect change for different targets

    asked by ashley --- HELP PLEASEE!!! on May 2, 2011
  8. physics

    Will the photoelectric effect change for different targets

    asked by ashley --- HELP PLEASEE!!! on May 2, 2011
  9. Physucs

    What model of light does the photoelectric effect support?

    asked by Beth on April 4, 2008
  10. Physics

    In the photoelectric effect, what determines the number of ejected electrons?

    asked by Rob on April 4, 2008

More Similar Questions