Intensity: A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.00 × 108 m/s)
A. 162 N/C
B. 212 N/C
C. 82.1 N/C
D. 150 N/C
E. 52.9 N/C
Answer: D
Physics & Space Science
You might also like to view...
When light is refracted, there is a change in its
A) frequency. B) wavelength. C) both of these D) neither of these
Physics & Space Science
If a lamp has a resistance of 265 ? when it operates at 250 W, what current does it carry?
a. 1.0 A b. 0.94 A c. 0.97 A d. 1.1 A e. 1.9 A
Physics & Space Science
Which of the following is true of asteroids?
A) They are small rocky worlds. B) They are small icy bodies. C) Most of them are the size of Earth. D) Most of them orbit between the orbits of Mercury and Venus.
Physics & Space Science
A car moves from the point (3.0 m)x + (5.0 m)y to the point (8.0 m)x - (7.0 m)y in 2.0 s. What is the magnitude of the average velocity of the car?
A) 6.5 m/s B) 13 m/s C) 9.0 m/s D) 4.5 m/s E) 3.3 m/s
Physics & Space Science