What evidence suggests that we live inside a hot local bubble?
What will be an ideal response?
X-ray telescopes in space reveal that we are surrounded by hot, X-ray-emitting gas coming from nearby in every direction. Surrounding this hot gas lies a region of much cooler gas. This suggests that a number of supernovae have detonated within our stellar neighborhood over the last several million years and that we and all our stellar neighbors live inside a hot bubble.
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The critical temperature above which pair production can occur is called the:
A) Chandrasekhar Limit. B) Cosmological Constant. C) fusion temperature. D) threshold temperature. E) event horizon.
An unknown resistor is wired in series and an ammeter and a voltmeter are placed in parallel across both the resistor and the ammeter. This network is then placed across a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is the true resistance. B) is greater than the true resistance. C) is less than the true resistance. D) could be anything. It depends on other factors.
He discovered what we now call Newton's first law of motion
A) Copernicus B) Galileo C) Ptolemy D) Tycho Brahe E) Kepler
A wave is described by y = 10 sin (4.0pt – 6.0px). If the equation is in SI units with the units suppressed, what is the wavelength of this wave?
a. 2/3 m c. 1/6 m b. 1/3 m d. 0.50 m