Which of the following best represents the energy transformations occurring in a photovoltaic cell?
A) electric ? radiant
B) thermal ? electric
C) thermal ? radiant ? electric
D) radiant ? electric
E) radiant ? thermal ? electric
D
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The speed of light divided by the wavelength of light is the wave _________.
Fill in the blank(s) with the appropriate word(s).
As waves enter shallow water, wave speed
A) decreases, causing the wave to bend perpendicular to the shore. B) increases, causing the wave to bend parallel to the shore. C) decreases, causing the wave to bend parallel to the shore. D) increases, causing the wave to bend perpendicular to the shore.
The maximum torque is exerted on a current loop when the plane of the loop is at what angle to the magnetic field?
A) 45.° B) 0.° C) 135.° D) 90.° E) -45.°
Faraday's Law: A flat coil is wrapped with 200 turns of very thin wire on a square frame with sides 18 cm long. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0.00 T in 8.0 s, find the emf induced in the coil.
A. 2.1 mV B. 4.1 mV C. 0.21 V D. 0.41 V