See Also
- [[Physics - Waves]]S
- [[Physics - Diffraction]]S
- [[Physics - Polarisation]]S
- [[Physics - Reflection and Refraction]]S
Flashcards
What is the intensity of a wave??
The radiant power passing through a surface per unit area.
What is the SIMPLE formula for intensity??
$$ I = \frac{P}{A} $$
What is the formula for intensity??
$$ I = \frac{P}{4\pi r^2} $$
Why does the intensity of a wave decrease as you move further away??
Energy is conserved but spread over a larger area, so each piece of area gets less energy.
What’s the equation for the intensity of this wave as radiant energy spreads out from a point??
$$ I = \frac{P}{4\pi r^2} $$
What’s the formula for the volume of a sphere??
$$ \frac{4}{3} \pi r^3 $$
What’s the formula for the surface area of a sphere??
$$ 4\pi r^2 $$
What is intensity directly proportional to??
$$ \text{intensity} \propto \text{amplitude}^2 $$
Backlinks
Metadata
date: 2021-03-18 16:03
tags:
- '@?physics'
- '@?waves'
- '@?school'
- '@?public'
- '@?year-1'
title: Physics - Intensity
