You observe a spiral galaxy with a large central bulge and tightly wrapped arms. It would be classified a
A) Sc.
B) Sb.
C) Sa.
D) SO.
E) E7.
C
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The concentration of oxygen in the atmosphere has been near or above its current value for the past
A) 200 million years B) 542 million years C) 65 million years D) 360 million years
What kind of telescopes are refracting, reflecting, and catadiaoptic telescopes?
What will be an ideal response?
White light is incident normally on a thin soap film having an index of refraction of 1.34
It reflects with an interference maximum at 684 nm and an interference minimum at 570 nm with no minima between those two values. The film has air on both sides of it. What is the thickness of the soap film? A) 766 nm B) 627 nm C) 638 nm D) 894 nm E) 510 nm
In the Drude model of electrical conduction, the current density is NOT directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the resistivity of the wire.