An electron traveling toward the magnetic north with speed 400 km/s enters a region where the earth's magnetic field has the magnitude 5.0 × 10-5 T and is directed downward at 45° below horizontal
What magnitude magnetic force acts on the electron? (e = 1.60 × 10-19 C)
2.3 × 10-18 N
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Potential: As a proton moves in a direction perpendicular to the electric field lines
A. it is moving from low potential to high potential and gaining electric potential energy. B. it is moving from low potential to high potential and losing electric potential energy. C. it is moving from high potential to low potential and gaining electric potential energy. D. it is moving from high potential to low potential and losing electric potential energy. E. both its electric potential and electric potential energy remain constant.
Electromagnetic radiation of wavelength 0.3 pico-meters is which type?
A) gamma rays B) visible C) X-rays D) FM-radio E) ultraviolet
In an equation, the symbol m generally stands for
a. inertia. b. torque. c. momentum. d. mass. e. meters.
A tuning fork with a frequency of 512 Hz is used to tune a violin. When played together, beats are heard with a frequency of 4 Hz. The string on the violin is tightened and when played again, the beats have a frequency of 2 Hz. The original frequency of the violin was
A. 510 Hz. B. 514 Hz. C. 516 Hz. D. 508 Hz.