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 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.
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
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
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.