What causes light to become brighter?

  • Thread starter MegaDeth
  • Start date
  • Tags
    Light
In summary, when you increase the voltage of a light bulb, you increase the current and this leads to more photons and a brighter light.
  • #1
MegaDeth
83
0
Why and how does light get brighter as you increase a light bulbs voltage?
 
Science news on Phys.org
  • #2
for a given frequency, brightness is just a measure of the number of photons. When you increase the current in a bulb wire it gets hotter and emits more photon. When you increase the voltage, you increase the current.

SO ... more voltage => more current => more photons => brighter
 
  • #3
Ahh right. So when current passes through and light bulb and heats it up, is the light produced when the electrons in the filament gain energy so they go up a shell then since there's an empty space, it goes back down into that space. So then it's releases that energy as a photon? So, by taking into account what you said, basically, as the temperature increases, from more current, the filament gets hotter, so more electrons are moving?
 
  • #4
That is pretty much correct. The more current through the filament the more it heats up. The more it heats up the more light it produces.
 
  • #5
Great! Only things is, I am watching this program about Quantum Mechanics and the guy on it said that photons of different frequencies of light have different amounts of energies. He was talking about the photoelectric effect. Is this true? Because I though than every photon has the same amount of energy, but the energy only increases because its frequency increases. So more photons pass a certain point in a period of time. So there is more energy but the amount of energy in each photon is the same.
 
  • #6
Each photon has a specific amount of energy that is determined by its wavelength or frequency. Red light has less energy than blue light because its wavelength is longer. Higher energy light isn't brighter though. Brightness is purely due to the amount of photons entering your eye.
 
  • #7
Oh, so every photon of a certain frequency has the same amount of energy but the energy of photons of different wavelengths or frequency. Are photons all the same size?
 
  • #8
I don't believe photons have a volume associated with them. IE they don't have a size. They are a wave of electric and magnetic fields that propegates through space.
 
  • #9
How does light actually travel? I know it travels in waves, do the photons follow that the shape of the wave? Also, why do they travel like that? Why not it a straight, direct line?
 
  • #10
The waves ARE the photon. The electric and magnetic field oscillate back and forth perpendicular to each other.
The depictions of all particles of little balls is incorrect. To understand the reality you would need to read up on Quantum Mechanics.
 

Related to What causes light to become brighter?

What causes light to become brighter?

There are a few different factors that can cause light to become brighter. One of the main factors is the amount of energy that is being emitted from the light source. When more energy is being produced, the light will appear brighter.

What effect does distance have on the brightness of light?

Distance also plays a role in the brightness of light. As light travels further away from its source, it becomes more spread out and therefore appears less bright. This is known as the inverse square law.

How does the color of the light affect its brightness?

The color of light can also impact its brightness. Generally, blue and violet light appear brighter than other colors because they have shorter wavelengths and higher energy levels.

Do different materials affect the brightness of light?

Yes, different materials can affect the brightness of light. Transparent materials allow more light to pass through, making the light appear brighter. Reflective materials can also increase the brightness of light by reflecting it in different directions.

What role do the human eye and brain play in perceiving brightness of light?

The human eye and brain play a crucial role in perceiving the brightness of light. The eye contains photoreceptor cells that detect the intensity of light, and the brain interprets this information to determine the perceived brightness. Our eyes can also adjust to different levels of light, which can affect our perception of brightness.

Similar threads

  • Optics
Replies
10
Views
1K
  • Optics
Replies
22
Views
2K
Replies
16
Views
1K
Replies
15
Views
2K
Replies
12
Views
1K
Replies
6
Views
524
Replies
13
Views
2K
Replies
1
Views
2K
Replies
22
Views
2K
Back
Top