Of all the terrestrial planets, ________ has the highest surface barometric pressure.
A. Mercury
B. Mars
C. Venus
D. Earth
Answer: C
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A compound microscope has a 18-cm-long barrel and an objective lens with a focal length of 8.0 mm
What is the focal length of the eyepiece to give a total magnification of 240? It is adjusted for minimum eyestrain for persons with a near point of 25 cm. A) 1.3 m B) 1.5 cm C) 1.9 cm D) 2.1 cm E) 2.3 cm
If f is the frequency of the emitted radiation, and h is Planck's constant (equal to 6.63 × 10^–34 J ? s), the energy E each emitted quantum of energy has in Planck's explanation of blackbody radiation is:
a. E = h / f. b. E = h f. c. E = h + f. d. E = mc2. e. E = f / h.
A helium-filled balloon has a volume of 1 m3 . As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are -40°C and 0.1 atm?
a. 4 b. 6 c. 8 d. 10 e. 1.5
Characteristics of Waves: What is the frequency of the wave shown in the figure?
A. 0.5 Hz. B. 1 Hz. C. 2 Hz. D. 4 Hz. E. It cannot be determined from the given information.