If we describe the double-slit experiment entirely in terms of electrons instead of in terms of fields, then which of the following is the best description of what one individual electron does in this experiment?
A) It goes through both slits.
B) It goes through either one or the other slit, but the observer does not know which one it actually goes through.
C) It doesn't go through the slits at all.
D) It turns into the tooth fairy.
E) It goes through either one or the other slit, and the observer does know which one it actually goes through.
A
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If we had never discovered quantum mechanics, which of the following would be true?
A) We would not have electronic devices such as cell phones and laptops. B) The physical world would behave much differently. C) Nothing would be different because quantum mechanics has not led to any changes in the lives of people. D) The Sun would not shine.
21-cm radio waves allow us to map the distribution of hydrogen in spiral arms on the opposite side of the Galaxy
Indicate whether the statement is true or false
It is possible for a medium-mass star to collapse and form a white dwarf, but no planetary nebula
a. True b. False Indicate whether the statement is true or false
Because we know that the half-lives of many radioactive isotopes are millions of years, we can deduce that
a. the longer it exists the more radioactive nuclei Earth produces. b. the sun is the source of all the radioactive nuclei on Earth. c. there must have been many more radioactive nuclei on Earth when life began. d. there must have been far fewer radioactive nuclei on Earth before life began. e. the natural radioactivity of minerals on the Earth was created by the Earth's internal temperature.