Light Notes with Answers - Shiow Me The Physics

Narrated Lesson

showmethephysics.com

Resonance Review

UC Irvine

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Bubbles
1st, 2nd, 3rd Harmonic
(B. Barrett)

IV. Light (electromagnetic waves)

A. Speed

1. 3 x 10⁸ m/s = c (in vacuum)

(fastest speed in universe)

In air v ≈ 3 x 10⁸ m/s

Did you know that
light can travel
about 7.5 times around the world
in 1 second!

v = fλ

c = fλ

3 x 10⁸ m/s = fλ

Divide both sides by λ

f = c/λ

Frequency, Wavelength

Relationship?

Inverse

Ex) What is the wavelength of light with a frequency of 7.69 x 10¹⁴Hz in a vacuum?

c = fλ

3 x 10⁸ m/s = 7.69 x 10¹⁴ Hz λ

λ = 4 x 10^-7 m

2. Speed of light depends on the medium