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Questions and Answers
What is the speed of light in vacuum?
What is the speed of light in vacuum?
- 300000000 m/s
- 299792458 m/s (correct)
- 2992458 km/s
- 294957 km/s
What are the primary properties of light?
What are the primary properties of light?
- Refraction, diffraction, interference, and polarization
- Frequency, velocity, amplitude, and wavelength
- Color, speed, temperature, and amplitude
- Intensity, propagation direction, frequency or wavelength spectrum, and polarization (correct)
In physics, what does the term 'light' refer to?
In physics, what does the term 'light' refer to?
- Electromagnetic radiation with wavelengths between 400–700 nm
- Electromagnetic radiation with wavelengths longer than 700 nm
- Only visible light
- Electromagnetic radiation of any wavelength, whether visible or not (correct)
What are photons?
What are photons?
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What is the range of wavelengths for visible light?
What is the range of wavelengths for visible light?
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Study Notes
Speed of Light
- Speed of light in vacuum is approximately 299,792 kilometers per second (km/s).
- It is often rounded to 300,000 km/s for simplicity in calculations.
Primary Properties of Light
- Light exhibits wave-particle duality, behaving both as a wave and as a particle.
- It travels in straight lines unless refracted, reflected, or diffracted.
- Light has properties such as reflection, refraction, dispersion, and interference.
- It carries energy and momentum, which can be transferred to other particles and systems.
Definition of Light in Physics
- In physics, 'light' refers to electromagnetic radiation within the spectrum of visible wavelengths, detectable by the human eye.
- The term encompasses all types of electromagnetic waves, including infrared, ultraviolet, and gamma rays, beyond just what is visible.
Photons
- Photons are elementary particles that represent quanta of light and other forms of electromagnetic radiation.
- They have no mass and carry energy that is dependent on their frequency, defined by the equation E = hf (where E is energy, h is Planck's constant, and f is frequency).
Wavelength Range for Visible Light
- The range of wavelengths for visible light is approximately 380 to 750 nanometers (nm).
- This range corresponds to the colors of the visible spectrum, from violet (shortest wavelength) to red (longest wavelength).
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