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) 210 J B) 170 J C) 340 J D) 250 J E) 300 J
B
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A blueberry will look black when illuminated with
A) red light. B) yellow light. C) magenta light. D) cyan light. E) none of the above
What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ? K
A) 582 nm B) 580 nm C) 576 nm D) 578 nm
The graph below shows the velocity versus time graph for a ball. Which explanation best fits the motion of the ball as shown by the graph?
a.
The ball is falling, is caught, and is thrown down with greater velocity.
b.
The ball is rolling, stops, and then continues rolling.
c.
The ball is rising, hits the ceiling, and falls down.
d.
The ball is falling, hits the floor, and bounces up.
e.
The ball is rising, is caught, and then is thrown down.
Light that has all the electrical fields vibrating in the same plane is said to be ________
Fill in the blank(s) with correct word