Question

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The various colors of visible light differ in:

a. its speed in a vacuum

b. frequency and its speed in a vacuum

c. wavelength only

d. frequency and wavelength

e. only in frequency

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A radio station transmits radio waves that radiate uniformly in all directions with power 1.50 x 10 ^ 5 W. Determine the intensity of the waves when they are received by an antenna located 40.0 km from the transmitting antenna.

a. 1.17 x 10 ^ -8 W / m ^ 2

b. 2.98 x 10 ^ -5 W / m ^ 2

c. 9.25 x 10 ^ -7 W / m ^ 2

d. 5.60 x 10 ^ -10 W / m ^ 2

e. 7.46 x 10 ^ -6 W / m ^ 2

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A 150-turn coil has a current of 12 A. The coil's radius is 0.050m and its length is 0.18m. Determine the magnetic flux through the circular area in the center of the coil.

a. 1.18 x 10 ^ -5 Wb

b. 4.3 x 10 ^ -4 Wb

c. 9.9 x 10 ^ -5 Wb

d. 2.2 x 10 ^ -3 Wb

e. 7.0 x 10 ^ -4 Wb

Answer 1