Astronomy and Cosmology L3

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Last updated 10:21 AM on 8/22/26
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12 Terms

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Light

Behaves as waves or particles and has no medium

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Velocity of light waves

V= Frequency x Wavelength

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Light speed

~ 3× 10^8 m/s

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White light

contains all visible wavelengths

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Wavelengths of visible light

400-700 nanometers

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Photons

Particles that move at the speed of light that have frequency proportional to energy

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Four fundamental forces

Gravity, the weak force, electromagnetic force, the strong force

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Gravity

The weakest fundamental force

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The weak force

Responsible for protons changing to neutrons but can only travel very small distances

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electromagnetic force

both attractive and repulsive and cannot travel long distances

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The strong force

applies under subnuclear distances and keep protons together even though they should repel

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Coulombs law

opposites attract