One phenomenon that supports the particle theory of matter is
A) the double-slit experiment with electrons.
B) the tiny flashes that are observed when a light beam strikes a screen.
C) interference effects with light.
D) the tiny flashes that are observed when an electron beam strikes a screen.
E) None of the above.
D
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In electron diffraction, an electron moving at speed v << c acts like
a. a particle with momentum mv. b. a particle with position coordinate v/t. c. a wave with wavelength v/t. d. a wave with wavelength h/mv. e. both a particle with position coordinate v/t and a wave with wavelength v/t.
Which of these statements is true for the image formed by an object placed in front of a thin lens?
A. convex lenses never produce virtual images B. real images are always enlarged C. real images are always inverted D. virtual images are always inverted
Three coplanar parallel straight wires carry equal currents I as shown below. The current in the outer wires is directed to the right, and that in the middle wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.
If the two 2nd order maxima (m = 2) are separated by 2.0 cm on the screen in a double-slit experiment, what is the separation of the m = 3 minima? Assume the angle is very small.
A. 1.5 cm B. 2.0 cm C. 2.5 cm D. 3.0 cm E. 3.5 cm