An electron with a charge value of 1.6 × 10^-19 C is moving in the presence of an electric field of 300 N/C. What force does the electron experience?
a. 2.3 × 10^-22 N
c. 6.4 × 10^-17 N
b. 4.8 × 10^-17 N
d. 1.9 × 10^-21 N
B
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Mesons are composed of
A. any odd number of quarks. B. three quarks of matching color. C. three quarks of three different colors. D. a colorless quark-antiquark pair.
Microfossil evidence suggests that life
A) originated when the Earth formed 4.6 billion years ago B) originated about 3.4 billion years ago C) existed 3.85 billion years ago D) existed and was well established by 3.4 to 3.5 billion years ago
The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
in SI units. What is the speed of the EM wave?
A. 3 × 108 m/s B. 100 m/s C. 106 m/s D. 2 × 107 m/s E. 2 × 108 m/s
X-rays with a wavelength of 0.00100 nm are scattered by free electrons at 130° from their original direction
What is the kinetic energy (in keV) of each recoil electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)