A 22-A current flows into a parallel combination of 4.0-?, 6.0-?, and 12-? resistors. What current flows through the 12-? resistor?
A) 18 A
B) 11 A
C) 7.3 A
D) 3.7 A
D
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A single slit is illuminated at normal incidence with a parallel beam of light having a wavelength of The entire central band of the diffraction pattern is observed at ±90°
The illumination is now replaced by a nonrelativistic beam of electrons, each having a kinetic energy of 980 eV. When this beam hits the slit at normal incidence, at what angle will the first minimum of the electron diffraction pattern occur? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J) A) 0.095 mrad B) 0.071 mrad C) 0.046 mrad D) 0.12 mrad E) 0.14 mrad
A 60.0-W light bulb radiates light uniformly in all different directions. What is the value of B at a distance of 0.700 m from the bulb?
A) 1.76 × 10-7 T B) 2.02 × 10-7 T C) 2.22 × 10-7 T D) 4.86 × 10-7 T E) None of the other answers is correct.
In the case of light waves, the thing doing the "waving" is
A) charged particles throughout the region between source and receiver. B) a gravitational field. C) the ether. D) an electromagnetic field. E) the air.
If the tension on a guitar string is increased by a factor of 2, the fundamental frequency at which it vibrates is changed by what factor?
a. 0.5 c. 2–1/2 b. 21/2 d. 2