An altocumulus cloud belongs to which cloud family?
a. Low
b. Clouds of vertical development
c. High
d. Middle
d
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Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30°with respect to the normal to the surface. What is the angle of reflection from the second surface? ?
A. ?30° B. ?60° C. ?45° D. ?53° E. ?75°
Calculate the ground state energy (in eV) for an electron in a box (an infinite well) having a width of 0.050 nm
a. 10 b. 75 c. 24 d. 150 e. 54
The center of mass and the center of gravity coincide
A) only if the object is symmetrical. B) only if the object is symmetrical and it is in a uniform gravitational field. C) if the object is in a uniform gravitational field. D) at all times.
The only valid electron state and shell designation among the following is
A) 1p, K (n = 1 ) shell. B) 2s, K (n = 1 ) shell. C) 1s, L (n = 2 ) shell. D) 2p, L (n = 2 ) shell. E) 3f, M (n = 3 ) shell.