Which of the following instruments detects and measures radioactivity?
a. Geiger counter
b. Cyclotron
c. Tokamak
d. Mass spectrometer
a
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In the context of neutron stars, which of the following statements is true of pulsars?
A) Neutron stars older than 10 million years rotate too slowly to generate detectable radio beams. B) When a pulsar first forms, it spins only around 10 times a second. C) As a pulsar blasts beams of radiation outward, its rotation speeds up. D) Supernova remnants last more than 150,000 years before they mix into the interstellar medium and disappear.
Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. What is the general trend in elemental abundance?
A) Elements with more protons are less abundant. B) Elements with more protons are more abundant. C) Elements heavier than iron do not exist. D) Elements heavier than iron are relatively abundant. E) There is no apparent trend in the abundance of elements.
Motion combines the concepts of position
change (length) and time. Which of the following combination of units is used to describe the velocity of a moving object? a)length/time b)length x time c)time/length d)Length/time2
An object is placed at the focal point of a converging lens and the light rays from the lens will be parallel to the principal axis. The object is now moved closer to the lens. Which statement is true about the light rays from the lens?
A. the will remain parallel to the principle axis B. they converge toward each other C. they emerge parallel to each other but not the principle axis D. they diverge from each other