A solar cell has a light-gathering area of 12.4 cm2 and produces 0.49 A at 0.93 V (dc) when illuminated with sunlight of intensity 884 W/m2 . What is the efficiency of the solar cell?
a. 42%
b. 3.4%
c. 64%
d. 1.7%
e. 19%
a
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A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T. What is the magnitude of the magnetic torque on the loop when the plane of its area is perpendicular to the magnetic field?
A) 0.00 N ? m B) 0.41 N ? m C) 0.47 N ? m D) 0.52 N ? m E) 0.58 N ? m
A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00 × 10^8 m/s)
a. 33.3 × 10^-6 s c. 66.7 × 10^-6 s b. 133 × 10^-6 s d. 0.0333 × 10^-6 s
How can some mergers activate spirals, and others destroy them?
What will be an ideal response?
The photons coming from an excited gas create a(n) ____ spectrum
a. absorption b. emission c. continuous d. Doppler e. ionization