For hydrogen, the transition from the second to the fourth energy level produces:
A) a red emission line.
B) a blue green absorption line.
C) a violet emission line.
D) an infrared emission line.
E) an ultraviolet absorption line.
B
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When tuning a radio to a particular station, you match the frequency of the internal electrical circuit with the frequency of the wanted radio station. What principle is being employed?
A) forced vibrations B) resonance C) beats D) reverberation E) wave interference
Plutonium is extremely rare in natural ore deposits because it
A) is artificially created. B) is chemically inert. C) is a gas at room temperature. D) has a tiny half-life compared with the age of Earth. E) none of the above
Two flat glass plates are in contact along one end and are separated by a sheet of paper 3.0 × 10^-6 m thick at the other end. The top plate is illuminated by a monochromatic light source of wavelength 490 nm. How many dark parallel bands will be evident across the top plate? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 13 c. 9 b. 7 d. 17
One common way to polarize a beam of light is to
A. slow it down using a piece of glass. B. filter out the longest wavelengths of the spectrum. C. use a sheet of Polaroid material. D. filter out the shortest wavelengths of the spectrum.