How wide must a narrow slit be if the first diffraction minimum occurs at ±12° with laser light of 633 nm?
a. 3.0 × 10^-6 m
b. 3.0 × 10^-5 m
c. 6.1 × 10^-6 m
d. 6 .1× 10-5 m
e. 1.5 × 10^-6 m
A
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At the microscopic level, electric currents in wires are due to
A) electromagnetic radiation. B) the great pumpkin. C) protons [and possibly other ions] traveling along the wire. D) atoms jiggling back and forth within the wire. E) electrons traveling along the wire.
Who discovered radium?
a. Marie and Pierre Curie b. Ernest Rutherford c. Henri Becquerel d. Niels Bohr
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer. b. Beryl, because low thermal conductivity results in high heat transfer. c. Sapphire, because low thermal conductivity results in low heat transfer. d. Sapphire, because low thermal conductivity results in high heat transfer. e. Neither, because low heat transfer is desirable both in summer and in winter.
A hologram like the one shown here cannot be fully appreciated from pictures shown in a book. Why is this?
a. The colors are brighter in a hologram. b. Textbook printing methods cannot reproduce any picture generated by laser light. c. A hologram appears as a three-dimensional image to the viewer, but not by viewing the flat page of a book. d. Information from each point in the scene is recorded in all points of the hologram.