Which one of the following is true?
A) Radio waves have a higher energy than gamma rays.
B) Radio waves have a higher frequency than ultraviolet radiation.
C) Infrared radiation has a longer wavelength than blue light.
D) Ultraviolet radiation has a longer wavelength than red light.
E) Blue light has a longer wavelength than red light.
Ans: C) Infrared radiation has a longer wavelength than blue light.
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Two charges of 15 pC and -40 pC are inside a cube with sides that are of 0.40-m length. Determine the net electric flux through the surface of the cube
a. +2.8 N × m2/C b. -1.1 N × m2/C c. +1.1 N × m2/C d. -2.8 N × m2/C e. -0.47 N × m2/C
A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be maximum when the particle moves
A) upward at an angle of 45° above the horizontal. B) straight upward. C) straight downward. D) horizontally.
A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 5.85 s. What was the height from which the ball was dropped? (g = 9.80 m/s2 and assume air resistance is negligible)
a. 1.88 × 10^2 m b. 1.68 × 10^2 m c. 1.38 × 10^2 m d. 3.36 × 10^2 m
Two particles move into a magnetic field. They enter moving at the same speed and direction. The magnitude of the charge on each is known to be the same. One particle curls to the right and the other to the left upon entering the field, the leftward moving particle moves in a larger circle than the rightward moving particle. From this we can say that
A. the leftward moving particle has more mass and is positively charged. B. the leftward moving particle has more mass and its charge is opposite the other particle. C. the rightward moving particle has less mass and is positively charged. D. the rightward moving particle has positive charge but we cannot say anything about its mass.