While many elemental spectral lines are visible, almost all molecular lines lie in the ________ portion of the spectrum, since they are at much lower energy
A) infrared B) radio C) X-ray D) ultraviolet E) visible light
B
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A gray opaque surface has an emissivity of 0.8 at 400ºF. Determine the radiosity if it is irradiated at 1000 Btu/hr?ft^2.
What will be an ideal response?
Quasar's spectral lines are:
A) emission lines with large redshifts. B) a continuum from the synchrotron radiation. C) fuzzy absorption lines from the merged light of the billions of stars. D) too complex for any interpretation. E) nonexistent, the gas so hot as to be totally ionized, so no lines are seen.
The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 ?T. What is the magnitude of the electric field for that wave at P? (c = 3.0 × 108 m/s)
A) 745 N/C B) 636 N/C C) 5.23 µN/C D) 7.45 µN/C E) 6.36 µN/C
Resistance and Resistivity: The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?
A. It is increased by a factor of 2. B. It is increased by a factor of 4. C. It is reduced by a factor of 2. D. It is reduced by a factor of 4. E. It is reduced by a factor of 8.