What process is illustrated in this diagram?
A) the annihilation of a particle and its antiparticle to make two photons
B) the creation of two photons from pure energy
C) the formation of an atom with a positive nucleus and a negative electron
D) the evaporation of a black hole
A) the annihilation of a particle and its antiparticle to make two photons
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What is the wavelength of the line in the Paschen series of hydrogen that is comprised of transitions from the n = 5 to the n = 3 levels? (R = 1.097 × 10^7 m?1 and 1 nm = 10?9 m)
a. 1406 nm b. 1282 nm c. 684 nm d. 750 nm e. 365 nm
A 2.00 kg hollow sphere of radius 6.00 cm starts from rest and rolls without slipping down a 10.0 degree incline. If the length of the incline is 50.0 cm, then the velocity of the center of mass of the hollow sphere at the bottom of the incline is
A. 1.51 
B. 1.47
C. 1.22
D. 1.01
E. 1.95
A car is traveling at 26.0 m/s when the driver suddenly applies the brakes, causing the car to slow down with constant acceleration. The car comes to a stop in a distance of 120 m. How fast was the car moving when it was 60
0 m past the point where the brakes were applied? A) 22.5 m/s B) 18.4 m/s C) 15.0 m/s D) 12.1 m/s E) 9.20 m/s
If the net force on a cart is tripled, the cart's acceleration
A) is one third. B) is two thirds. C) is three times as much. D) is more than three times as much.