The wave front shown at the left for light in air reaches the plane surface (shown by a slanted line) that bounds a medium with n = 1.50
Which diagram below correctly shows the wave front while entering the medium at the right?
b
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A filament of tungsten wire is 0.001 m in diameter, and the filament is heated to 2500 K. The work function of tungsten is 4.5 eV.
(a) Calculate the probability of electrons having sufficient energy to be emitted from the filament. (b) Calculate the emission current density from the tungsten wire. (c) What length of wire can produce a thermionic electron current of 1 A?
What causes the large gaps in the asteroid belt (often called Kirkwood gaps)?
A) large asteroids that clear certain regions of the asteroid belt B) tidal forces from Jupiter C) tidal forces from the Sun D) orbital resonances with Jupiter E) the competing gravitational tugs of Mars and Jupiter
What would you see if you were on the Moon during a solar eclipse?
What will be an ideal response?
If the plates of a charged parallel plate capacitor were moved further apart, while the charge on the plates is kept constant, the potential energy of each of the charges on the capacitor would
A. increase or decrease depending on the initial plate separation. B. decrease. C. increase. D. remain the same.