As shown below, a garden room has three walls, a floor, and a roof, but is open to the garden on one side. The wall widths are L and w. The roof height is h. When traveling sound waves enter the room, standing sound waves can be present in the room if the wavelength of the standing waves is
?
?
a.
, where n is a positive integer.
b.
e
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Which element represented most of the atoms in the early Universe?
a. helium b. hydrogen c. oxygen d. carbon e. nitrogen
Which of the Galilean moons is the densest and most geologically active?
A) Io B) Europa C) Ganymede D) Callisto E) Titan
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes dimmer for about 2 hours. The most likely explanation is that
A) the star is a Cepheid variable. B) the star is a member of an eclipsing binary star system. C) the star is periodically ejecting gas into space, every 73 hours. D) the star is a white dwarf.
The Eocene is a(n)
a. epoch. b. era. c. eon. d. period.