Two optically flat glass plates, 16.0 cm long, are in contact at one end and separated by 0.0200 mm at the other end. The space between the plates is occupied by oil with index of refraction 1.45. The index of refraction of the glass plates is 1.55
The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. If the dark fringes are spaced 2.00 mm apart, what is the wavelength of the monochromatic light? A) 425 nm
B) 475 nm
C) 525 nm
D) 675 nm
E) 725 nm
E
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Fig. 28-6 shows two long, parallel current-carrying wires. The wires carry equal currents I1 = I2 = 20 A in the directions indicated and are located a distance d = 0.5 m apart. Calculate the magnitude and direction of the magnetic field at a point located at an equal distance d from each wire.
a. 4?T upward b. 8?T upward c. 4?T to the right d. 8?T downward e. 4?T downward
Suppose that an aluminum wire were to be strung out in a loop that just fits snugly around the equator (assuming a perfectly spherical Earth with a radius of 6.37 × 106 m)
If the temperature of the wire is increased by 0.50°C, and the increase in length is distributed equally through the entire length, how far off the ground will the wire loop be? The coefficient of linear expansion of aluminum is 24 × 10-6 K-1. A) 7.6 mm B) 76 mm C) 76 cm D) 76 m E) 760 m
A quantity that is measured in ohms is
a. voltage. b. current. c. resistance. d. electric field. e. critical temperature.
A plucked guitar string produces a sound wave of frequency 440 Hz
(a) What is the wavelength of the sound wave (assume the speed of sound in air is 340 m/s)? (b) How much time elapses between the impacts of two adjacent compressions on your eardrum?