An electron enters a magnetic field of 0.75 T with a velocity perpendicular to the direction of the field. At what frequency does the electron traverse a circular path? (mel = 9.11 × 10-31 kg, e = 1.60 × 10-19 C)
A) 2.1 × 1010 Hz
B) 4.8 × 10-7 Hz
C) 2.1 × 1014 Hz
D) 4.8 × 10-11 Hz
A
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If an electron is released at the equator and falls toward the Earth under the influence of gravity, the magnetic force on the electron will be toward the:
a. south. b. east. c. west. d. north.
Snell's Law: A flashlight beam makes an angle of 60° with the plane of the surface of a calm lake before it enters the water. In the water what angle does the beam make with the plane of the surface? The index of refraction of water is 1.33.
A. 0° B. 30° C. 60° D. 22° E. 68°
Suppose that Mercury grew to its present size in 1 million years through the accretion of particles averaging 100 g each. On average how many particles did Mercury capture each second? Note: Mercury has a mass of 3.3 × 10^23 kg and a radius of 2439 km
a. about 24 particles per second b. about 3.3 × 10^21 particles per second c. about 67 particles per second d. about 100 million particles per second e. about 100 billion particles per second
Current flows through a resistor
A) with no direction since it is not a vector. B) from any potential to any different potential. C) from high potential to low potential. D) from low potential to high potential. E) cannot be determined