# Waves, Light and Sound - Physics 101 / AP Physics 1 Review with Dianna Cowern | Summary and Q&A

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January 19, 2021
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Physics Girl
Waves, Light and Sound - Physics 101 / AP Physics 1 Review with Dianna Cowern

## TL;DR

Waves carry energy, and their speed, wavelength, and frequency are interconnected. Light and sound waves can be transverse or longitudinal, and their behavior depends on the medium through which they travel.

## Key Insights

• 👋 Waves are disturbances that carry energy through a medium.
• 👋 Waves can be transverse or longitudinal, depending on the direction of the medium's movement.
• 👋 Properties like wavelength and frequency play a crucial role in determining characteristics such as the pitch of sound waves and the color of light waves.
• 👋 Understanding the relationship between wavelength, frequency, and speed helps analyze and calculate various aspects of wave behavior.
• 🥺 Waves can interact with matter, leading to phenomena like refraction, reflection, and diffraction.
• 🙂 The speed of light in a vacuum is constant, but it slows down when passing through different media.
• 👋 The Doppler effect explains how waves change frequency and wavelength when the source or observer is in motion.

## Transcript

i've got here a slinky and i'm going to send a wave down the length of the slinky by pushing it inwards like that and now i have a question for you how can i make that wave move faster down the slinky i'm going to intuit that a lot of you probably guessed you push harder so let's check it out no no matter how hard i push the wave still moves the sa... Read More

### Q: What is a wave?

A wave is a disturbance or displacement of some medium that carries energy. It can be transverse, like light waves, or longitudinal, like sound waves.

### Q: How do transverse and longitudinal waves differ?

In transverse waves, the medium moves perpendicular to the energy direction, while in longitudinal waves, the medium moves back and forth along the energy direction.

### Q: How do properties like wavelength and frequency affect waves?

Wavelength is the distance between two identical points on a wave, while frequency is the number of oscillations per second. Higher frequency means shorter wavelength, affecting characteristics like the pitch of sound waves and the color of light waves.

### Q: How does the speed of waves relate to their wavelength and frequency?

The speed of a wave can be calculated by multiplying its wavelength and frequency, following the equation v = λf. This relationship helps understand how different properties of waves are interconnected.

## Summary & Key Takeaways

• Waves are disturbances or displacements in a medium that carry energy, such as the wave created in a slinky or the waves in the ocean.

• Waves can be transverse, where the medium moves perpendicular to the energy direction, like light waves, or longitudinal, where the medium moves back and forth along the energy direction, like sound waves.

• The properties of waves include wavelength, frequency, and amplitude, which affect various aspects such as the pitch of sound waves and the color of light waves.