The element potassium should produce compounds most similar to those of
a. Tc.
b. Na.
c. Al.
d. Sr.
b
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Which of the following statements is true of the dynamo effect?
A) It is related to the degeneration of the Sun's magnetic field at the bottom of the convection zone deep under the photosphere. B) It is believed to trap ionized gases in a magnetic arch that rises up through the photosphere and enters the lower corona. C) It is believed to operate in the liquid metal of Earth's core to produce Earth's magnetic field. D) It is related to the creation of a Doppler shift toward shorter wavelengths caused by a velocity of approach.
A light ray enters a glass enclosed fishtank. From air it enters the glass at 20.° with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33
(a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?
One of the advantages of charge-coupled devices over photographic plates is that a CCD can record bright and faint objects on the same exposure
Indicate whether the statement is true or false
The quark and antiquark in a meson are always of the same flavor
Indicate whether the statement is true or false