The bending of light rays around corners is called
a. reflection.
b. refraction.
c. interference.
d. diffraction.
d
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Which of these lamps employs semi-conductor technology?
A) incandescent lamp B) fluorescent lamp C) CFL D) LED
Boiling water burns are less damaging than steam burns because boiling water
A) doesn't condense and release additional energy. B) has less energy per kilogram than steam. C) both of these D) none of the above
The force that holds electrons within atoms is the
A. magnetic force between the electrons. B. gravitational force with the nucleus. C. nuclear force with the nucleus. D. electrical force with the nucleus.
In a demonstration, a 4.00 cm2 square coil with 10 000 turns enters a larger square region with a uniform 1.50 T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4 000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
a. 7.5 × 10^-3 cm. b. 0.015 cm. c. 7.5 cm. d. 13 cm. e. 15 cm.