A grating is to be used to find the wavelength of the emission spectrum of a gas. The grating spacing is not known,
but light of a known wavelength of 632.8 nm is deflected by 43.2° in the second order by this grating. Light of the wavelength to be measured is deflected by 34.9° in the second order. What is the wavelength of the light that is to be measured?
529 nm
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Star clusters are important to the study the stellar evolution because stars in a given cluster have the same
a. temperature. b. mass. c. age. d. luminosity.
Kepler's second law implies that
a. a planet should move at its greatest speed when it is closest to the Sun. b. the most massive planets will have the greatest speed in their orbits. c. the speed of a planet in its orbit depends on the size of the epicycle. d. the mass of the planet determines how far the planet is from the Sun. e. the deferent and the epicycle have to be attached to the Sun and not Earth.
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2. What is the magnitude of the electric field at any point not on either surface?
A. 1.1 N/C B. 5.6 N/C C. 7.9 N/C D. 3.8 N/C E. 4.0 N/C
Because of refraction a fish in the water appears
A) nearer the surface. B) deeper in the water. C) at its actual depth.