The diagram above represents energy levels in a hydrogen atom. Each level is labeled with its energy (above the ground state of Level 1) in units of electron/volts (eV). The labeled transitions represent an electron moving between energy levels. Which transition represents an electron that is breaking free of the atom?
A) A
B) B
C) C
D) D
E) E
A) A
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Nucleosynthesis
a. is the process by which energy is produced at the center of the galaxy. b. is the process by which hydrogen and helium are converted into heavier elements. c. describes the structure of a globular cluster. d. describes how the magnetic field of the galaxy traps cosmic rays. e. describes the method by which neutral hydrogen produces 21 cm radiation.
If the absolute magnitude, M, of a supernova is x 19 and a galaxy is found that contains a supernova with an apparent magnitude, m, of 16 . What is the distance to the galaxy? Hint: dpc = 10(m - M + 5)/5 using a scientific calculator
a. 100 AU b. 100 pc c. 100 ly d. 100 kpc e. 100 Mpc
During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
A) to increase the force exerted on the bullet due to the expanding gases from the gunpowder B) to reduce the force exerted on the bullet due to the expanding gases from the gunpowder C) to reduce frictional losses D) to exert a larger force on the shells E) to allow the force of the expanding gases from the gunpowder to act for a longer time
If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year,
what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction? (1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg) A) 0.35 kg B) 3.3 × 108 kg C) 1.1 × 108 kg D) 390 kg E) 1.75 kg