How is quantum tunneling important to our existence here on Earth?
A) It explains how neutron stars are able to stay stable rather than collapsing under their strong gravity.
B) It explains why electrons in atoms gradually fill different energy levels, thus making chemistry possible.
C) It plays a crucial role in nuclear fusion in the Sun, so that our Sun would not shine brightly without it.
D) It is very important to understanding the law of conservation of energy.
C
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Suppose an object is moving in a straight line at 50 miles/hr. According to Newton's first law of motion, the object will
A) continue to move in the same way forever, no matter what happens. B) continue to move in the same way until it is acted upon by a force. C) eventually slow down and come to a stop. D) continue to move in a straight line forever if it is in space, but slow and stop otherwise. E) continually slow down but never quite come to a complete stop.
This figure shows hydrogen's three isotopes: (a) hydrogen, (b) deuterium, and (c) tritium. How many protons and neutrons does the isotope oxygen 15 have?
a. 7 protons and 8 neutrons b. 8 protons and 7 neutrons c. 8 protons and 15 neutrons d. 15 protons and 8 neutrons e. 8 protons and 15 neutrons
The air temperature where the humidity reaches the saturation density is called the ___________
Fill in the blank(s) with correct word
Which of the following is transported by all traveling waves?
A) light B) matter C) particles D) energy E) both energy and matter