How do scientists determine the age of fossils?
A) They only determine relative ages by assuming that deeper layers of sedimentary rock are older.
B) They use radiometric dating to measure the age of the surrounding rocks.
C) They cannot.
B
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Shapley found the distance to the center of the galaxy by studying the distance to open clusters
a. True b. False Indicate whether the statement is true or false
Imagine placing two long wires parallel to each other. If conventional currents flow through them in the directions shown, will the wires attract, repel, or exert no net force on each other?
A. Attract each other
B. Repel each other
C. Exert no net force on each other
Two objects of different masses have momentum of equal, non-zero magnitude. Which object has more kinetic energy?
A) the heavier object B) the lighter object C) They both have the same kinetic energy.
If the wavelength of sound is increased by a factor of 3, what happens to its speed and frequency?
1.Its speed increases by a factor of 3, and so does its frequency. 2.Its frequency increases by a factor of 3, but the speed stays the same. 3.Its frequency decreases by a factor of 3, but its speed stays the same. 4.Its speed decreases by a factor of 3, and so does its frequency.