What frequency of electromagnetic radiation has photons of energy 4.7 × 10-25 J? (h = 6.626 × 10-34 J ? s)
A) 710 kHz
B) 4.7 MHz
C) 710 MHz
D) 1.4 GHz
C
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In any star cluster, stars with lower masses greatly outnumber those with higher masses
Indicate whether the statement is true or false
You place a box on a smooth and evenly-sanded wooden board. Raise one end of the board so that the angle increases. Eventually, the box starts to slide along the board. If you maintain this angle of the board, the box
1.will move at constant speed along the ramp. 2.will do none of these. 3.will slow down and stop along the ramp. 4.will speed up along the ramp.
The tail of a comet is shortest when the comet is
a. closest to the Sun. b. farthest from the Sun. c. closest to Earth. d. farthest from Earth.
Overall, current data suggest that ________ of stars are orbited by one or more planets.
A) at least about 70% B) approximately 1% C) approximately 20% D) no more than 30%