The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.939 W/m2. The wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles
How much total electromagnetic energy falls on the area during 1.0 minute? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 170 J
B) 210 J
C) 250 J
D) 300 J
E) 340 J
A
You might also like to view...
Light of wavelength 400 nm falls on a metal surface having a work function 1.70 eV
What is the maximum kinetic energy of the photoelectrons emitted from the metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s = 4.141 × 10-15 ev ? s, 1 eV = 1.60 × 10-19 J) A) 1.41 eV B) 1.70 eV C) 3.11 eV D) 2.82 eV E) 4.52 eV
A 30-mF capacitor is charged to an unknown potential V0 and then connected across an initially uncharged 10-mF capacitor. If the final potential difference across the 10-mF capacitor is 20 V, determine V0
a. 13 V b. 27 V c. 20 V d. 29 V e. 60 V
A baseball is thrown and lands 120 m away. While the ball is in flight, assuming the effect of air friction is negligible, which of the following is true?
a. At maximum height the ball has its greatest kinetic energy. b. The horizontal component of the baseball's kinetic energy is constant. c. The vertical component of the baseball's kinetic energy is constant. d. The mechanical energy of the baseball is greater when nearer to the ground. e. No answer above is correct.
A 2.25-kg object is attached to a horizontal an ideal massless spring on a frictionless table. What should be the spring constant of this spring so that the maximum acceleration of the object will be g when it oscillates with amplitude of 4.50 cm?
What will be an ideal response?