Photoelectric effect, mercury vapor lamp

In summary, during a lab on photoelectric effect, different colors were measured for their wavelength/frequency by finding stopping voltage vs current. The wavelength of 400nm was measured using a mercury vapor lamp without a color filter, leading to questions about why this specific wavelength was measured and how it was able to be emitted. In a scenario with a bulb emitting two colors capable of ejecting electrons, the color with the most energetic electrons would correspond to the measured stopping potential.
  • #1
korky0429
1
0
I had a lab with photoelectric effect and we measured different colors wavelength/frequency by finding stopping voltage vs current.

Then we used no color filter and used the mercury vapor lamp and had to find the wavelength which was around 400nm. Questions were why was this wavelength the one that was measured since the light emits other wavelengths and why this was able to be emitted.
 
Physics news on Phys.org
  • #2
Suppose you had a bulb that emitted two colors: blue and green and that both colors are capable of ejecting electrons in the photoelectric effect. Which color would emit the most energetic electrons? Which color would correspond to the measured stopping potential?
 

Related to Photoelectric effect, mercury vapor lamp

1. What is the photoelectric effect?

The photoelectric effect is the phenomenon where electrons are emitted from a solid material when it is exposed to light. This effect was first observed by Heinrich Hertz in 1887.

2. How does the photoelectric effect work?

The photoelectric effect occurs when photons (particles of light) strike the surface of a material, causing electrons to be released from the atoms of that material. The energy of the photons must be greater than the work function of the material in order for this process to occur.

3. What is a mercury vapor lamp?

A mercury vapor lamp is a type of electric lamp that uses an electric arc through vaporized mercury to produce light. These lamps are commonly used for street lighting and in industrial and commercial settings.

4. How does a mercury vapor lamp produce light?

A mercury vapor lamp produces light through a process called fluorescence. The mercury atoms in the lamp's arc emit ultraviolet light, which is then converted into visible light by a phosphor coating on the inside of the lamp's glass tube.

5. What are the advantages of using a mercury vapor lamp?

Mercury vapor lamps have a longer lifespan and are more energy-efficient than traditional incandescent lamps. They also produce a bright, white light that is similar to natural sunlight, making them ideal for outdoor lighting and sports stadiums.

Similar threads

  • Introductory Physics Homework Help
Replies
17
Views
549
  • Introductory Physics Homework Help
2
Replies
35
Views
2K
  • Introductory Physics Homework Help
Replies
4
Views
3K
Replies
5
Views
821
  • Introductory Physics Homework Help
Replies
1
Views
1K
  • Introductory Physics Homework Help
Replies
1
Views
2K
Replies
5
Views
2K
  • Introductory Physics Homework Help
Replies
1
Views
3K
  • Introductory Physics Homework Help
Replies
4
Views
1K
  • Introductory Physics Homework Help
Replies
2
Views
1K
Back
Top