Which event marks the beginning of a supernova?
A) the expansion of a low-mass star into a red giant
B) the beginning of neon burning in an extremely massive star
C) the onset of helium burning after a helium flash in a star with mass comparable to that of the Sun
D) the sudden collapse of an iron core into a compact ball of neutrons
E) the sudden outpouring of X-rays from a newly formed accretion disk
D
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The figure shows the equation of time; notice that the vertical axis shows "apparent solar time minus means solar time." Suppose the date is about Feb. 15 and you have a digital watch that is set to the local mean solar time. If the watch say sit is precisely noon, then
A) the Sun will reach your meridian in about 15 minutes. B) the Sun is now crossing your meridian. C) the Sun crossed your meridian about 15 minutes ago. D) the Sun is now at its highest point in your sky.
When mass is accreted into a black hole, what fraction of the total mass-energy can be radiated away?
A) 0.007% B) 0.08% C) 1.4% D) 20% E) 50%
Conservation of ____________ is observed in strong and electromagnetic interactions but not in weak interactions
a. baryon number b. lepton number c. strangeness d. charm e. beauty
Why is the number of galaxies in the Local Group uncertain?
What will be an ideal response?