If the de Broglie wavelength of an electron is 44nm, what is its velocity. the mass of an electron is 9.11x10^-31kg
Answer: 1.7x10^4m/s
Physics & Space Science
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Uncharged particles in an atom are called ________.
A. neutrinos B. protons C. positrons D. electrons E. neutrons
Physics & Space Science
An automobile manufacturer claims that its product will, starting from rest, travel 0.40 km in 9.0 s. What is the magnitude of the constant acceleration required to do this?
A. 9.9 m/s2 B. 8.9 m/s2 C. 6.6 m/s2 D. 5.6 m/s2 E. 4.6 m/s2
Physics & Space Science
During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle?
A) 712 J B) 586 J C) 460 J D) 126 J
Physics & Space Science
When water vapor changes phase to become water in a cloud, the surroundings become
A) cooler. B) warmer. C) both of these D) neither of these
Physics & Space Science