Which of the following is considered by scientists to be physically "real," but yet is not made of atoms or of other material particles such as protons, electrons, etc.?
A) the air
B) neutron stars
C) electromagnetic fields
D) the ether
E) Nonsense--we have known since Democritus that everything is made only of atoms and empty space.
C
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A series LR circuit consists of a battery, resistor, inductor and a switch. When the switch is closed the circuit has a time constant of 8.0 s. If the resistance and inductance of the circuit are both doubled, what is the resulting time constant?
A. 8.0 s
B. 16 s
C. 32 s
D. 4.0 s
E. 2.0 s
If y = 0.02 sin (30x ? 400t) (SI units), the angular frequency of the wave is
a. 30 rad/s b. 30/2? rad/s c. 400/2? rad/s d. 400 rad/s e. 40/3 rad/s
The core of the Sun is at a temperature of about 20,000 K
Indicate whether the statement is true or false
A muon detector on Mount Washington observes greater numbers of muons than an identical detector located at a lower elevation, for example in Boston. The number detected in Boston, however, is much greater than the number predicted when considering the elevation separation between Boston and Mount Washington, the muons' speed, and the time of the muons' half-life. Why is this so?