A planoconvex lens of radius R and index of refraction n is placed curved side down on flat glass surface. This configuration is being used to measure the wavelength of light produced by a particular light source. If the radius of the dark rings produced by interference is r, what is the wavelength of the light? Assume the setup is in air
1. rn/mR
2. Rn/mr
3. mR/nr2
4. R2/mR
4
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Which of the following statements is true of brown dwarfs?
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Millisecond pulsars that are very old are
a. believed to be the result of mass transfer from a companion that increased the spin of the pulsar. b. all single objects. c. not spinning as rapidly as they seem because they have four hot spots that produce the flashes. d. X-ray binaries. e. gamma-ray bursters.
All but one of the following are necessary to create a functioning laser through stimulated emission. Which one is not necessary?
1.The system must consist of a stable gas. 2.The system must primarily be in an excited state. 3.The excited state must be metastable. 4.It must be possible for the emitted photons to stay within the system long enough to stimulate the emission of other photons.
Resistance and Resistivity: A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side. An ohmmeter measures 0.040 ? across its ends. What is the resistivity of the material from which this rod is made?
A. 0.023 ? ? m B. 0.015 ? ? m C. 1.5 × 10-4 ? ? m D. 2.3 × 10-6 ? ? m