The lowest frequency visible light is
a. violet
b. red
c. blue
d. green
e. yellow
D
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The highest frequency visible light is
a. violet. b. red. c. blue. d. green. e. yellow.
What kind of variable stars are pre-Main Sequence stars undergoing gravitational contraction and exhibiting erratic changes in their luminosities?
A) R Coronae Borealis B) RR Lyrae C) Cepheid D) T Tauri E) Herbig-Haro
Two cables of the same length are made of the same material, except that one cable has twice the diameter of the other cable
When the same potential difference is maintained across both cables, which of the following statements are true? (There may be more than one correct choice.) A) The electrons have the same drift velocity in both cables. B) The same current flows through both cables. C) Both cables carry the same current density. D) The current in the thin cable is four times as great as the current in the thick cable. E) The current in the thin cable is twice as great as the current in the thick cable.
A 1 cm object is placed 20 cm from a lens. The lens forms a real and inverted image of size 1.5 cm. What is the focal length of the lens?
A. 8.0 cm B. 16 cm C. 12 cm D. 20 cm E. 24 cm