What is the difference between a synodic month and a sidereal month?
A) 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).
B) 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.
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 the Earth.
A) 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).
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Photoelectric Effect: A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV. What is the wavelength of this light? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 350 nm B. 330 nm C. 300 nm D. 380 nm E. 410 nm
One of the methods used to date supernova remnants (the remains of exploded stars) today is by using
A. the works of Ptolemy. B. the records of ancient Chinese, Japanese, and Korean astronomers. C. Kepler's laws. D. the notebooks of Galileo.
A current may be induced in a coil by
a. moving one end of a bar magnet through the coil. b. moving the coil toward one end of the bar magnet. c. holding the coil near a second coil while the electric current in the second coil is increasing. d. all of the above. e. none of the above.
What maximum power can be generated from an 18-V emf using any combination of a 6.0-W resistor and a 9.0-W resistor?
a. 54 W b. 71 W c. 90 W d. 80 W e. 22 W