What frequency must a photon have to change the energy of a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 3.06 × 1014 Hz
B) 6.16 × 1014 Hz
C) 4.11 × 1014 Hz
D) 5.20 × 1014 Hz
E) 9.24 × 1014 Hz
B
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From the 1970s to the present, the accepted value of H has almost doubled, so
A) the age of the universe is twice as old as we originally believed. B) the age of the Universe is half what we believed. C) the Copernican principle is not valid beyond our solar system. D) the ages of the oldest globular clusters are invalid. E) the critical density must also be halved.
A carbon nanotube is a single sheet of ______________rolled into a tube.
Fill in the blank(s) with the appropriate word(s).
Which of the following best defines an embedded font?
A. CSS specification that identifies the preferred font as well as backup fonts. B. A list of web-safe fonts. C. A font standard that includes compression. D. A font, specified in the CSS for a webpage, that must be downloaded to the user's device.
Helium-neon laser light (? = 6.33 × 10^?7 m) is sent through a 0.30-mm-wide single slit. What is the width of the central maximum on a screen 1.0 m from the slit?
a. 2.0 cm b. 4.2 mm c. 1.1 cm d. 2.0 mm e. 0.70 mm