According to Einstein, increasing the brightness of a beam of light without changing its color will increase:
a. the number of photons.
b. the energy of each photon.
c. the speed of the photons.
d. the frequency of the photons.
a
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Current: If a quantity you calculated has units of A ? s, what is that quantity?
A. potential B. resistivity C. resistance D. capacitance E. charge
A particle (q = ?4.0 ?C, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2 . What is the magnitude of the magnetic field?
a. 5.3 mT b. 4.9 mT c. 5.1 mT d. 4.7 mT e. 3.6 mT
An object moves 15.0 m north and then 11.0 m south. Find both the distance it has traveled and the magnitude of its displacement
A) 4.0 m, 26.0 m B) 26.0 m, 4.0 m C) 26.0 m, 26.0 m D) 4.0 m, 4.0 m
If you are in the Earth's umbra on the Earth's surface, then
A) the Moon is always visible. B) it must be a lunar eclipse of some type. C) it must be a total solar eclipse. D) it is night time. E) the Sun is always visible.