The objective lens of a high-power microscope will have a ________ (large, short) focal length and will be a ________ (converging, diverging) lens.
Fill in the blank(s) with the appropriate word(s).
short, converging
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Foliation in metamorphic rocks is due to directed stress, which causes elongated minerals to orient themselves
A) in parallel planes with the face of each plane parallel to the direction of maximum stress. B) in alignment. C) so that smaller crystals precede larger crystals. D) in parallel planes perpendicular to the direction of maximum stress.
Atomic Nucleus: The atomic number of an atom is equal to the number of what particles in the nucleus?
A. protons B. neutrons C. nucleons D. electrons E. positrons
What type of lens is a magnifying glass?
A) converging B) diverging C) spherical D) cylindrical E) achromatic
If three samples have the half-lives listed below, which is the most radioactive?
A) a sample with a half-life of 20 minutes B) a sample with a half-life of 20 hours C) a sample with a half-life of 20 years D) a sample with a half-life of 20 million years E) none of the above