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
Thickness of paper	E-4	m
Thickness of human hair	E-4	m
Mass of moon	7E22	kg
Seconds in a year	3E7	seconds
Atoms in 1 mole (or molecules/particles)	6E23	atoms
Speed of sound	340	m/s
Number of stars in average galaxy	E11	stars
Lightyear	E16	m
Furlong	200	m
Distance between Earth and moon	4E8	m
Mass of proton/neutron	2E-27	kg
Radius of Milky Way	5E4	light years
Speed of light	3E8	m/s
Mass of sun / solar mass	2E30	kg
Height of Mount Everest	E4	m
Mile (1.6 km)	5E3	ft
Minutes in a year	5E5	minutes
Radius of Earth	6E6	m
Mass of Earth	6E24	kg
Distance between Milky way and Andromeda	3E6	light years
Diameter of sun	1.4E9	m
Mass of electron	E-30	kg
Volume of Earth's water	1E9	km^3
Charge of electron	E-19	coulombs
Radius of Andromeda	E5	light years
Radius of moon	2E6	m