The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of a photon emitted corresponding to a transition from the n = 6 to n = 2 state?
a. 7.9 eV
c. 3.0 eV
b. 2.9 eV
d. 4.0 eV
C
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The energy required to accelerate a ship the mass of an ocean liner to a cruising speed of 10% of the speed of light is approximately
A) one million times the Earth's current annual energy usage B) one hundred times the Earth's current annual energy usage C) equal to the Earth's current annual energy usage D) ten times the Earth's current annual energy usage
Figure 4–53 shows a block (mass mA) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block which hangs vertically.
(a) Draw a free-body diagram for each block, showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force.
(b) Apply Newton’s second law to find formulas for the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord.
Molecular Speeds: A sample of an ideal gas is heated and its Kelvin temperature doubles. If the root-mean-square speed of its molecules was originally v, what is the new root-mean-square speed?
A. 4v
B. 2v
C. v
D. v/
E. v/4
All neutrinos are left handed
a. True b. False Indicate whether the statement is true or false