When a neutron decays, a proton and an electron are observed. When the electrons emitted from a sample of neutrons are observed, they are found to have different kinetic energies. This was accounted for by
a. introducing a different particle, the neutrino.
b. introducing the effect of gravity on the particles.
c. including the kinetic energies of the neutron and proton.
d. modifying the laws of conservation of momentum and energy.
e. taking into account the uncertainties associated with Heisenberg's Uncertainty Principle.
a
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If Venus once had an ocean, where did it go?
A) It exists as abundant water vapor in the planet's atmosphere. B) It was lost to space, stripped away by the solar wind. C) The water broke into hydrogen, which escaped to space, and oxygen, which became trapped in the planet's surface rocks. D) It exists trapped in the crust but below the surface. E) It is found in the cooler polar regions, like at the Moon and Mercury.
An electron has the same de Broglie wavelength as the wavelength of a 1.8 eV photon. What is the speed of the electron?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J) A) 1,100 m/s B) 980 m/s C) 910 m/s D) 840 m/s E) 770 m/s
Which of the following is not one of the three basic types of materials emitted when a volcano erupts?
a. Lava b. Breccia c. Gas d. Pyroclastics
An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
a. 35 m/s b. 25 m/s c. 30 m/s d. 21 m/s e. 17 m/s