Cathode rays and ________ are both streams of electrons.
Fill in the blank(s) with the appropriate word(s).
beta rays
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Suppose that Mercury grew to its present size in 1 million years through the accretion of particles averaging 100 g each. On average how many particles did Mercury capture each second? Note: Mercury has a mass of 3.3 × 10^23 kg and a radius of 2439 km
a. about 24 particles per second b. about 3.3 × 10^21 particles per second c. about 67 particles per second d. about 100 million particles per second e. about 100 billion particles per second
What is the relationship between the image distance and the object distance for a plane (flat) mirror?
A. They are not related B. The image distance is double the object distance C. The image distance is half the object distance D. They are the same.
In the periphery of our vision, we are
A) more sensitive to low frequencies than high ones. B) insensitive to color and movement. C) sensitive to movement, but cannot see color. D) sensitive to both movement and color. E) none of the above
A sterilizing impact is one during which
A) all life on a planet is completely destroyed B) most life on the surface of a planet is destroyed but life in the oceans or beneath the surface might survive C) a planet is fragmented into pieces D) life on a planet is rendered incapable of reproduction