Which of these is NOT an argument for Cygnus X-1 being a black hole?
A) The mass of the X-ray source is about 10 solar masses.
B) It is the third strongest source of X-rays in the sky.
C) The X-rays from the compact source vary in as little as a millisecond.
D) Spectroscopic data suggests hot gas is flowing toward the X-ray source.
E) The mass of the visible star is greater than that of the X-ray source.
E
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________ clusters are blue in color and diffuse
Fill in the blank(s) with correct word
Terminal Voltage and Internal Resistance: A battery you buy at the store has an internal emf of 3.0 V. If it has an internal resistance of 14.0 ?, that current will this battery put out if it is short-circuited?
A. 0.21 A B. 42 A C. 4.7 A D. 130 A
What is the difference between a synodic month and a sidereal month?
A) A synodic month is our 30 or 31 day calendar month and a sidereal month is the time it takes for a cycle of the Moon's phases. B) A synodic month is the time it takes for a cycle of lunar phases and a sidereal month is the time it takes the Moon to orbit Earth (relative to the stars). C) A synodic month is the time it takes for a cycle of the Moon's phases and a sidereal month is our 30 or 31 day calendar month. D) A synodic month is based on the orbit of some planet around the Sun and a sidereal month is based on the orbit of the Moon around Earth.
According to the law of Malus, the transmitted intensity of a polarized beam of light passing through a polarizer is unchanged for an angle of 90°
Indicate whether the statement is true or false