A system of a proton and an electron has a net charge of
a. +1.6 × 10^-19 C.
b. –1.6 × 10^-19 C.
c. 3.2 × 10^-19 C.
d. zero.
d
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Which of the following statements best explains what we mean when we say that the electroweak and strong forces "froze out" at 10-38 second after the Big Bang?
A) These two forces first became distinct at this time. B) These forces are important only at temperatures below the freezing point of water—a temperature that the universe reached at an age of about at 10-38 second. C) Freezing out was a term coined by particle physicists who think that the Big Bang theory is really cool. D) Following this time, neither the strong nor electroweak forces were ever important in the universe again.
The weight of a 1-centimer cubed metal cube scaled up by a factor of 10 will be
A) ten times as much. B) a hundred times as much. C) a thousand times as much. D) none of the above
Calculate
(a) Calculate the distance required to reduce a beam of photons of energy 1.0 eV that have entered germanium to 50 percent of the initial intensity. (b) What is the wavelength of photons of energy 1.0 eV? (c) Photons of 1.0 eV correspond to what type of electromagnetic radiation? (d) Comment on using germanium for the lenses of an optical system to operate with 1.0 eV photons.
Which adjective does not necessarily describe a known feature of the early universe? (Be sure to consider the universe as a whole, not just the observable universe.)
A) filled with intense radiation B) hot C) dense D) small