About This Chapter
Overview of Light in Physics - Chapter Summary
If you want to discover or get reacquainted with the basics of light in physics, you've reached the right place! This chapter closely examines topics like the wave theory of light, kinetic energy of photoelectrons and multiple-slit diffraction. Check your knowledge of concepts covered in the lessons by taking the accompanying quizzes. Any questions you develop while studying the lessons can be submitted to our experts via the Dashboard. Upon completion of this chapter, you will be able to:
- List and describe the 7 major regions of the electromagnetic spectrum
- Calculate the energy of electromagnetic waves
- Discuss evidence backing the wave theory of light
- Provide the definition and description of a photon
- Exhibit knowledge of the equation for the energy and momentum of a photon
- Define and describe the kinetic energy of photoelectrons
- Offer a description of multiple-slit diffraction
- Demonstrate an ability to apply wave interference formulas
1. The 7 Major Regions of the Electromagnetic Spectrum
This lesson will walk you through each of the major regions of the electromagnetic spectrum. Explore the unique characteristics of X-rays, microwaves, radio waves, UV rays, infrared, gamma rays, and of course, visible light.
2. Practice Calculating Energy of Electromagnetic Waves
Electromagnetic waves range from tiny gamma rays to large radio waves. In this lesson, we'll calculate the energy of various electromagnetic waves including how this applies to the photoelectric effect.
3. The Wave Theory of Light: Definition & Evidence
After completing this lesson, you will be able to explain what light is and why we thought it was nothing but a wave before the 20th century. At the end, test what you've learned with a short quiz.
4. What is a Photon? - Definition, Energy & Wavelength
In this lesson, we will learn the definition of a photon. We will also explain Planck's constant and its relationship to the photon energy and wavelength. The calculation of photon energy is also demonstrated.
5. Energy & Momentum of a Photon: Equation & Calculations
After watching this lesson, you will be able to explain what wave-particle duality is, provide the equations for the energy and momentum of a photon of light, and use those equations to solve problems. A short quiz will follow.
6. Kinetic Energy of Photoelectrons
Shining a light on a metal ejects electrons from the metal giving the electrons a specific kinetic energy. This lesson will explore how this kinetic energy varies based on the material the light is shining on, and light source itself.
7. Multiple-slit Diffraction: Interference Pattern & Equations
After watching this lesson, you will be able to describe the diffraction pattern produced by multiple slits, as well as how it differs from single-slits and double-slits. You will also be able to list examples of diffraction gratings in real life and solve problems to figure out the position of the maxima and minima produced when light in shined through a diffraction grating. A short quiz will follow.
8. Practice Applying Wave Interference Formulas
Wave interference can be constructive or destructive, creating light and dark spots. We can calculate the distance between light spots, the distance between a screen and slits, and the distance between slits.
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Other chapters within the Physics 111: Physics I course
- Math Basics for Physics
- The Scientific Model
- Using Vectors in Physics
- Displacement, Velocity & Acceleration
- Understanding Kinematics in Physics
- Basics of Newton's Laws of Motion
- Newton's Law of Gravitation
- Understanding Work, Energy & Power
- Linear Momentum
- Overview of Rotational Motion
- Overview of Oscillations in Physics
- Overview of Waves in Physics
- Overview of Sound in Physics
- Overview of Fluids in Physics
- Studying for Physics 111