What is the kinetic energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT?
a. 0.65 eV
b. 0.71 eV
c. 0.84 eV
d. 0.54 eV
e. 1.4 eV
b
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The relative magnetic permeability of a vacuum is equal to _________.
Fill in the blank(s) with the appropriate word(s).
A positive magnetic susceptibility is due to an applied magnetic field orienting electron _________in the direction of the applied magnetic field.
Fill in the blank(s) with the appropriate word(s).
Ray says that interference effects cannot be observed with visible light because random phase changes occur in time intervals less than a nanosecond. Stacy says that doesn't matter if collimated light from a single source reaches multiple openings. (They are arguing about a light source 50.0 cm away from two 0.0100-mm-wide slits, 2.00 mm apart, with a screen 1.00 m away from the slits.) Which
one, if either, is correct, and why? a. Ray, because the phases at the two slits will be random and different. b. Ray, because it takes light over 3 ns to travel 1.00 m to the screen. c. Stacy, because the difference in time of travel from the source to the slits is no more than about 7 × 10?12 s. d. Stacy, but only if a lens is placed in front of the slits. e. Both, because interference of light never occurs outside a physics lab.
Two thin slits are 6.00 ?m apart. Monochromatic coherent light falls on these slits, and produces a fifth-order bright interference fringe at an angle of 32.3° away from the centerline. What is the wavelength of the light?
A) 164 nm B) 416 nm C) 614 nm D) 641 nm