Suppose you take the eyepiece out of a microscope and replace it with an eyepiece having twice the focal length. The magnification of the microscope will
A. double.
B. halve.
C. remain unchanged.
D. quadruple.
E. none of these.
B. halve.
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At what point is the Moon closest to Earth?
a. apogee b. perigee c. umbra d. penumbra e. prominence
In the context of astronomy, _____ is the area visible in an image
A) the field of view B) the visible spectrum C) a reference field D) point of reference
A substance has a melting point of 20°C and a heat of fusion of 3.9 x 104 J/kg. The boiling point is 150°C and the heat of vaporization is 7.8 x 104 J/kg at a pressure of 1.0 atm
The specific heats for the solid, liquid, and gaseous phases are 600 J/(kg?K), 1000 J/(kg?K), and 400 J/(kg?K), respectively. The quantity of heat required to raise the temperature of 3.80 kg of the substance from -61°C to 128°C, at a pressure of 1.0 atm, is closest to A) 620 kJ. B) 470 kJ. C) 560 kJ. D) 210 kJ. E) 770 kJ.
The vibrational frequency of an HF molecule is 8.72 × 1013 Hz and the reduced mass of the molecule is 1.589 × 10-27 kg
What is the ground state vibrational energy of an HF molecule? (1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 0.30 eV B) 0.18 eV C) 0.12 eV D) 0.36 eV E) 0.24 eV