Which of the following wavelengths could NOT be present as a standing wave in a 2 m long organ pipe open at both ends?
a. 4 m
b. 2 m
c. 1 m
d. 0.89 m
e. 0.5 m
d
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Normal galaxies in the present never went through an active galaxy phase
a. True b. False Indicate whether the statement is true or false
A ball is dropped from an upper-story dorm window. Neglecting air resistance, what is the speed of the ball when it has fallen 2.5 m?
Consider some material that has been cooled until it has become a superconductor. If it is cooled even further its resistance will:
a. stay constant and non-zero. c. decrease. b. increase. d. None of these choices.
Brown dwarfs are ____
a. stars with a very thick dust sphere around them, so they appear "brown" b. low mass M type stars with hundreds of planets c. an anomaly because they are extremely small but have relatively high temperature d. protostars that could not ignite the fusion of hydrogen at their core e. has a surface temperature of 2500 K by fusing hydrogen