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Ch 4: Light in Astronomy: Help and Review

About This Chapter

The light in astronomy chapter of this Intro to Astronomy Help and Review course is the simplest way to master understanding light in astronomy. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of light in astronomy.

Who's it for?

Anyone who needs help learning or mastering Intro to Astronomy material will benefit from taking this course. There is no faster or easier way to learn introductory astronomy. Among those who would benefit are:

  • Students who have fallen behind in understanding light in astronomy
  • Students who struggle with learning disabilities or learning differences, including autism and ADHD
  • Students who prefer multiple ways of learning science (visual or auditory)
  • Students who have missed class time and need to catch up
  • Students who need an efficient way to learn about light in astronomy
  • Students who struggle to understand their teachers
  • Students who attend schools without extra science learning resources

How it works:

  • Find videos in our course that cover what you need to learn or review.
  • Press play and watch the video lesson.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Verify you're ready by completing the light in astronomy chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the light in astronomy chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any light in astronomy question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

This chapter helps students review the concepts in a light in astronomy unit of a standard Intro to Astronomy course. Topics covered include:

  • Defining light
  • The nature of light: origin, spectrum and color frequency
  • Definition, sources and properties of electromagnetic waves
  • Seven major regions of the electromagnetic spectrum
  • The angle of incidence and curved surfaces in reflection
  • Resonance: definition and transmission of waves
  • Transparent and opaque materials in electromagnetic waves
  • Color, white light, reflection and absorption
  • Refraction and dispersion, Snell's law and index of refraction
  • Diffraction: relation to sound and light, and effects of wavelength
  • Wave-particle duality
  • The source and appearance of spectra
  • Spectra images and the emission or absorption of light
  • Intrinsic and apparent properties of stars
  • Using the magnitude system to compare star brightness and color
  • The speed of light

19 Lessons in Chapter 4: Light in Astronomy: Help and Review
Test your knowledge with a 30-question chapter practice test
The Nature of Light: Origin, Spectrum & Color Frequency

1. The Nature of Light: Origin, Spectrum & Color Frequency

This lesson introduces the basics of visible light and color. Learn how the visible light spectrum is divided into the six color ranges. We'll also discuss why different people name colors in different ways.

Electromagnetic Waves: Definition, Sources & Properties

2. Electromagnetic Waves: Definition, Sources & Properties

In this lesson, learn the basics of electromagnetic waves and how they make up the electromagnetic spectrum. We will explore the major trends and categories within the spectrum, as well as the various sources of electromagnetic waves.

The 7 Major Regions of the Electromagnetic Spectrum

3. 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.

Reflection: Angle of Incidence and Curved Surfaces

4. Reflection: Angle of Incidence and Curved Surfaces

How do waves reflect off of surfaces? How do we account for the images that we see reflected in various objects? Discover the answers to these questions as we investigate the rays and angles defining the law of reflection.

Resonance: Definition & Transmission of Waves

5. Resonance: Definition & Transmission of Waves

This lesson describes how sound and light waves are affected by the principle of resonance. Learn how resonance occurs through the vibrations and resonant frequencies of objects. You'll investigate everyday examples of resonance and learn how to break a wine glass with your voice!

Transparent and Opaque Materials in Electromagnetic Waves

6. Transparent and Opaque Materials in Electromagnetic Waves

What makes an object transparent or opaque? How does light pass through some objects and not others? And what about the other types of electromagnetic waves? We'll investigate all these questions in this lesson about the transparency and opacity of materials.

Color: White Light, Reflection & Absorption

7. Color: White Light, Reflection & Absorption

What gives color to objects? How do light waves interact with materials to produce red and green or white and black? In this lesson, learn how white light is composed of all colors and how absorption and reflection influence our color perception.

Refraction & Dispersion: Definition, Snell's Law & Index of Refraction

8. Refraction & Dispersion: Definition, Snell's Law & Index of Refraction

Refraction explains why light bends in water. But, did you know that mathematical laws determine exactly how light waves are bent? In this lesson, we'll explore the mechanics of wave refraction, including Snell's Law and the index of refraction.

Diffraction: Relation to Sound & Light and Effects of Wavelength

9. Diffraction: Relation to Sound & Light and Effects of Wavelength

This lesson explores diffraction as one of the many behaviors of waves. Learn how diffraction occurs in sound and light waves and how it is affected by the wavelength of a wave. Find out how animals use diffraction to communicate and how scientists use it to study molecules.

Wave-Particle Duality: Concept, Explanation & Examples

10. Wave-Particle Duality: Concept, Explanation & Examples

Is light a particle with mass and substance? Or, is it just a wave traveling through space? Most scientists say light is both a particle and a wave! Find out how they came to this strange conclusion as we learn about the theory of wave-particle duality.

Wave Parameters: Wavelength, Amplitude, Period, Frequency & Speed

11. Wave Parameters: Wavelength, Amplitude, Period, Frequency & Speed

How do we measure and describe waves? How do waves differ based upon their shapes? This lesson will guide you through the five wave parameters - period, frequency, amplitude, wavelength, and speed - that we use to characterize waves.

What is Light?

12. What is Light?

This lesson will define and describe what light is from both technical and more common-use perspectives, discuss what the different kinds of light are, and explain why it's called radiation.

What is a Photon? - Definition, Energy & Wavelength

13. 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.

The Speed of Light: Distance & Light-Years

14. The Speed of Light: Distance & Light-Years

This lesson will tell you what the speed of light is, what a light year is, what lookback time is, and why it is that we see many objects in space as they were a long time ago.

Quantum Physics: Definition, Theories & Topics

15. Quantum Physics: Definition, Theories & Topics

While exploring this lesson, you will learn what quantum physics, otherwise known as quantum mechanics, is, examine some of its theories and topics, and discover the weird consequences that go along with it. A short quiz will follow.

How Light & Matter Interact

16. How Light & Matter Interact

This lesson will go over the fundamental basic of how light and matter interact with one another. You'll learn about photons, excited atoms, binding energy, and energy levels.

Blackbody & Blackbody Radiation Theory

17. Blackbody & Blackbody Radiation Theory

This lesson will go over the perfect absorber and emitter of radiation, something called a blackbody, as well as the concept of blackbody radiation and electromagnetic radiation.

What Are Wien's Law & the Stefan-Boltzmann Law?

18. What Are Wien's Law & the Stefan-Boltzmann Law?

This lesson will explain why an object glows and why it changes color with temperature as we take a look at blackbodies, electromagnetic radiation, Wien's Law, and the Stefan-Boltzmann Law.

Calculations with Wien's Law & the Stefan-Boltzmann Law

19. Calculations with Wien's Law & the Stefan-Boltzmann Law

This lesson will go over the equations, as well as some calculations, for Wien's law and the Stefan-Boltzmann law. You will learn what factors these laws depend upon and what they reveal.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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