Stars of the main sequence, like our own, are all converting ________ into helium
Fill in the blank(s) with correct word
hydrogen
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Frank says that quantum mechanics does not apply to baseballs because they do not jump from quantum state to quantum state when being thrown. Francine agrees with him. She says that there is no uncertainty in a baseball's position or momentum. Are they correct, or not, and why?
a. They are correct because the first excited state of a baseball is at a higher energy that any baseball ever receives. Therefore we cannot determine whether or not there is uncertainty in its position or momentum. b. They are correct because the first excited state of a baseball is at a higher energy that any baseball ever receives. Therefore its position and momentum are completely uncertain until it is caught. c. They are wrong because the baseball goes through so many quantum states in being thrown that we cannot observe the transitions. The uncertainties in its position and momentum are too small to observe. d. They are wrong because the baseball goes through so many quantum states in being thrown that we cannot observe the transitions. Because of the number of transitions its position and momentum are completely uncertain until it is caught. e. Quantum mechanics states that they are correct as long as they do not make any observations, but wrong as soon as they begin to make observations.
Which of the following is not involved in cave formation in limestone?
A) mildly acidic groundwater B) dissolution of carbonate rocks C) land subsidence D) a dropping water table
All Cepheid variables discovered so far lie in other galaxies
Indicate whether the statement is true or false
100 coins, each with a Head and a Tail, are tossed randomly onto a table. A microstate is defined as the number of Heads that appear after the toss. What is the value for the number of Heads that has the most number of microstates?
A. 95 B. 75 C. 60 D. 50