Energy Levels: A hydrogen atom makes a downward transition from the n = 15 state to the n = 5 state. Find the wavelength of the emitted photon. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2.56 ?m
B. 1.54 ?m
C. 2.05 ?m
D. 3.07 ?m
Answer: A
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A) Saturn only B) Jupiter and Saturn only C) all but Neptune D) all four of the jovian planets have rings.
The planet with Red Spot Junior is
a. Jupiter. b. Neptune. c. Uranus. d. Saturn. e. Mars.
Spherical Mirrors: An object that is 10.0 cm tall is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm. How tall is the image?
A. 2.5 cm B. 5.0 cm C. 7.5 cm D. 20.0 cm E. 10.0 cm
Thin Lenses: A certain slide projector has a lens of focal length 15.0 cm. This lens forms an image measuring 100 cm × 100 cm on the screen when a slide whose dimensions are 50.0 mm × 50.0 mm is being magnified. How far from the lens should the screen be placed?
Fill in the blank(s) with the appropriate word(s).