What is the thickness of a soap bubble film (n = 1.38 ) that results in a constructive interference in the reflected light if this film is illuminated by a beam of light of wavelength 610 nm?
A) 222 nm
B) 111 nm
C) 333 nm
D) 444 nm
E) 555 nm
B
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The apparent visual magnitude of a star is 7.3 . This tells us that the star is
a. one of the brighter stars in the sky. b. bright enough that it would be visible even during the day. c. not visible with the unaided eye. d. very far from Earth. e. very close to Earth.
Force on a Moving Charge: A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?
A. upward B. northward C. southward D. eastward E. westward
Two water waves, call them X and Y, have the same amplitude, but X has a higher frequency than Y. Regarding their wavelengths and their energies,
A) Y has the larger wavelength and the two waves carry the same energy. B) X has the larger wavelength and carries the greater energy. C) Y has the larger wavelength and carries the greater energy. D) Y has the larger wavelength and X carries the greater energy. E) X has the larger wavelength and Y carries the greater energy.
The sun's energy output is a maximum in the visible region of the spectrum. One biological reason we might expect or predict this fact is that
A) it would be impossible for biological photosynthesis to occur if any other region dominated the solar spectrum, and thus plant life could not exist on Earth. B) the visible region comes right in the middle of the overall electromagnetic spectrum. C) visible radiation is the only type of solar radiation with enough energy to actually burn our skin. D) the human eye would be expected to evolve in such a way as to make use of the sun's main energy output. E) the visible region has the highest frequency.