Sunlight takes about 8.4 minutes to travel from the Sun to Earth. When NASA's New Horizons Spacecraft passed Pluto in 2015, it was about 32 AU from Earth. About how long did it take for transmitted images of Pluto to travel from the spacecraft to Earth?
A) one Plutonian year
B) 4-1/2 hours
C) 2-1/4 days
D) 3 weeks
E) They arrived almost instantaneously.
C) 2-1/4 days
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The Great Explosion of Eta Carinae expelled about ________ solar masses of material and released about as much visible energy as a supernova
Fill in the blank(s) with correct word
Assuming that xenon (atomic number 54) and krypton (atomic number 36) have the same temperature and pressure, in which gaseous medium does sound travel faster?
A) Xenon B) Krypton C) a mixture of both D) the same in both
An electron is in an infinite square well (a box) that is 2.0 nm wide. The electron makes a transition from the n = 8 to the n = 7 state,
what is the wavelength of the emitted photon?(h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19) A) 880 nm B) 750 nm C) 610 nm D) 1000 nm E) 1100 nm
From the point of view of an observer on the earth, a muon produced high in the atmosphere can reach the ground before decaying because
a. relativity gives it extra time to get there b. of the uncertainty principle c. it is a short distance to the ground d. relativity shortens the distance to the ground