Two charged bodies separated by a distance d exert an attractive electrical force on each other. The signs of the charges on the two bodies are __________ and __________
Fill in the blank(s) with correct word
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Monochromatic light strikes a metal surface and electrons are ejected from the metal. If the intensity of the light is increased, what will happen to the ejection rate and maximum energy of the electrons?
A) same ejection rate; greater maximum energy B) same ejection rate; same maximum energy C) greater ejection rate; same maximum energy D) greater ejection rate; greater maximum energy
The tails streaming from a comet's coma are caused by
A. radiation pressure and the particle wind from the Sun pushing them out. B. explosive forces from the hot nucleus ejecting the gas. C. the comet leaving the material behind it as it travels forward. D. the comet's magnetic field channeling and ejecting the particles of the tail.
If a jet plane were to double its MACH-speed, its half-angle will
A) decrease. B) increase. C) stay the same.
Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal numbers of moles of gas. The gram-molecular mass of He is twice that of H2. Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
A. The total internal energy of the hydrogen is the same as that of the helium. B. The total internal energy of the hydrogen is 1.4 times that of the helium. C. The total internal energy of the helium is 1.4 times that of the hydrogen. D. The total internal energy of the hydrogen is 1.67 times that of the helium. E. The total internal energy of the helium is 1.67 times that of the hydrogen.