A diffraction 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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The evolution of a "high mass star" is different from the evolution of smaller stars because these stars ____
a. do not generate strong stellar winds b. rotate faster c. have stronger magnetic fields d. can ignite carbon fusion e. are never in binary systems
Resistors in Combination: Three 2.0-? resistors are connected to form the sides of an equilateral triangle ABC as shown in the figure. What is the equivalent resistance between any two points, AB, BC, or AC, of this circuit?
A. 2.0 ? B. 6.0 ? C. 4.3 ? D. 3.3 ? E. 1.3 ?
As measured from the Earth, a spacecraft is moving at speed 0.80c toward another spacecraft moving at speed 0.60c in the same direction, i.e., the first spacecraft is catching up with the second spacecraft. What is the speed of the first spacecraft as viewed from the second spacecraft?
a. 0.38c b. –0.20c c. –0.38c d. not given
The lift experienced by Maglev trains is due to magnetic
A) attraction. B) repulsion. C) dipoles.