Fermi Questions Amounts

Format answers as (coefficient)E(power): 1000 = 10E3

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Last updated: February 8, 2024

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Question	Answer	Unit
Diameter of sun	1.4E9	m
Radius of Milky Way	5E4	light years
Radius of Earth	6E6	m
Atoms in 1 mole (or molecules/particles)	6E23	atoms
Mass of electron	E-30	kg
Height of Mount Everest	E4	m
Volume of Earth's water	1E9	km^3
Mass of proton/neutron	2E-27	kg
Thickness of paper	E-4	m
Mass of sun / solar mass	2E30	kg
Distance between Milky way and Andromeda	3E6	light years
Mass of moon	7E22	kg
Mass of Earth	6E24	kg

Question	Answer	Unit
Mile (1.6 km)	5E3	ft
Number of stars in average galaxy	E11	stars
Distance between Earth and moon	4E8	m
Seconds in a year	3E7	seconds
Thickness of human hair	E-4	m
Speed of light	3E8	m/s
Radius of Andromeda	E5	light years
Speed of sound	340	m/s
Furlong	200	m
Radius of moon	2E6	m
Charge of electron	E-19	coulombs
Lightyear	E16	m
Minutes in a year	5E5	minutes