Light Flashcards
(41 cards)
How do we see light as?
As color and brightness
It’s actually electromagnetic radiation,and it flows in a straight line.
Light
Where does light come from?
From the Sun and stars and other stuff too
Where does the creation of light start?
With the atoms
The Electrons stay in the orbit unless?
- They get kicked to another orbit.
- If we add energy to the atoms it will heat up and jump to a BIGGER orbit
- When they cool down,they return to their original orbits.
- Their return or ‘jump’ back to their original orbit emits light as a form of energy.
What does the color of light depend on?
The bigger the jump of the atoms between the orbits.
The bigger the _____, the higher the ______.
Jump,
energy
If a blue photon has more energy than red,then what does energy determine?
Color
Each electron that jumps back emits one _______.
Photon
What is light made of?
Photons
Why is light weird?
It has dual personality since it can act as both :
Waves and Particles
Photon as a PARTICLE
- It’s a particle, but it has no mass.
- photons are like sands.They can be seen when many but they cannot be seen as a grain or a single photon.
- Light comes in bundles,called photons.
Photon as a WAVE
- A wave has a wavelength,speed,and frequency.
- Energy ^ = frequency ^
- The color depends on frequency.
- frequency ^ = wavelength gets shorter
Light’s speed travels ___________.
300,000,000 meters/second
OR 186,000 miles/second
How many minutes does it take for the photons to travel from the Sun to Earth?
8 minutes
All light travels same _____.
Speed
Wave properties of light
- Refraction
- Reflection
- Diffraction
- Interference
When a wave strikes an object and bounces off.
Reflection
A line perpendicular to the reflecting surface.(based on reflection)
Normal
A.K.A the “incoming ray”,it hits the barrier or surface.
Incident Ray
This is where the bouncing of light happens,and it creates the angle of reflection.
Reflecting ray
Angle formed by the reflected ray and the normal.
Angle of reflection
Angle formed by the incident ray and the normal.
Angle of Incidence
• Angle of Incidence = Angle of Reflection
• The reflecting ray,incident ray,and normal all lie in the SAME plane.
Law of Reflection
