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Questions and Answers
What is the speed of light in a vacuum?
What is the speed of light in a vacuum?
- 299,792,458 feet per second (ft/s)
- 299,792,458 kilometers per hour (km/h)
- 299,792,458 kilometers per second (km/s)
- 299,792,458 meters per second (m/s) (correct)
Which type of electromagnetic radiation has a wavelength between 400-700 nanometers?
Which type of electromagnetic radiation has a wavelength between 400-700 nanometers?
- Ultraviolet (UV) Light
- Visible Light (correct)
- Gamma Rays
- X-Rays
What is the frequency range of light?
What is the frequency range of light?
- 4.3 x 10^10 to 7.5 x 10^10 Hz
- 4.3 x 10^7 to 7.5 x 10^7 Hz
- 4.3 x 10^5 to 7.5 x 10^5 Hz
- 4.3 x 10^14 to 7.5 x 10^14 Hz (correct)
What is the characteristic of light where it exhibits both wave-like and particle-like properties?
What is the characteristic of light where it exhibits both wave-like and particle-like properties?
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What is the wavelength range of Violet light?
What is the wavelength range of Violet light?
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Study Notes
Properties of Light
- Light is a form of electromagnetic radiation
- Has both wave-like and particle-like properties (dual nature)
- Travels at a speed of approximately 299,792,458 meters per second (m/s) in a vacuum
- Has a frequency range of 4.3 x 10^14 to 7.5 x 10^14 Hz
Types of Light
- Visible Light: Electromagnetic radiation with a wavelength between 400-700 nanometers (nm), perceived by the human eye
- Colours of the visible spectrum:
- Red: 620-750 nm
- Orange: 590-620 nm
- Yellow: 570-590 nm
- Green: 520-570 nm
- Blue: 450-520 nm
- Indigo: 420-450 nm
- Violet: 400-420 nm
- Colours of the visible spectrum:
- Invisible Light: Electromagnetic radiation with a wavelength outside the visible spectrum
- Ultraviolet (UV) Light: 100-400 nm
- X-Rays: 0.01-10 nm
- Gamma Rays: <0.01 nm
- Infrared (IR) Light: 700-1 mm
Behavior of Light
- Reflection: Bouncing back of light when it hits a surface
- Refraction: Bending of light as it passes from one medium to another
- Diffraction: Bending of light around a corner or obstacle
- Interference: Superposition of light waves, resulting in constructive and destructive patterns
- Absorption: Absorption of light by a material, converting it into heat or other forms of energy
Applications of Light
- Illumination: Lighting for human vision and daily activities
- Communication: Fiber optic communication systems, transmitting data through light signals
- Medical: Laser surgeries, cancer treatments, and diagnostic tools
- Energy: Solar power generation, using sunlight to produce electricity
Properties of Light
- Light is a form of electromagnetic radiation
- Exhibits dual nature, having both wave-like and particle-like properties
- Travels at a speed of approximately 299,792,458 meters per second (m/s) in a vacuum
- Has a frequency range of 4.3 x 10^14 to 7.5 x 10^14 Hz
Types of Light
Visible Light
- Has a wavelength between 400-700 nanometers (nm)
- Perceived by the human eye
- Consists of:
- Red: 620-750 nm
- Orange: 590-620 nm
- Yellow: 570-590 nm
- Green: 520-570 nm
- Blue: 450-520 nm
- Indigo: 420-450 nm
- Violet: 400-420 nm
Invisible Light
- Has a wavelength outside the visible spectrum
- Includes:
- Ultraviolet (UV) Light: 100-400 nm
- X-Rays: 0.01-10 nm
- Gamma Rays: smallest wavelength, high-energy radiation
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