How much energy must be absorbed to ionize a hydrogen atom whose electron is in the ground state (n = 1)?
a. Zero
b. 1 eV
c. 0.053 eV
d. 13.6 eV
d
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If H equals 50 km/sec/Mpc, then a galaxy with a radial velocity of 50,000 km/sec will have a distance of about 1 Mpc
Indicate whether the statement is true or false
What are the most likely sources of the methane gas detected in the Martian atmosphere by the Mars Express orbiter and the Curiosity rover?
A) biological activity only B) biological or geological activity C) comet impacts only D) geological activity only
Addition by 1. Components: The figure shows four vectors, 
, 
, 
, and 
, having magnitudes 10.0 m, 8.00 m, 6.00 m, and 2.00 m, respectively. Find the magnitude of the sum of these four vectors.
Fill in the blank(s) with the appropriate word(s).
A 100 keV photon undergoes Compton scattering. What is the greatest amount of kinetic energy that can be given to the electron in this process?
A. 100 keV B. 71.8 keV C. 83.6 keV D. 28.2 keV E. 16.4 keV