Circular Apertures: A round 0.85-mm-diameter hole is illuminated by infrared light of wavelength 2.5 ?m What is the angle of the first dark fringe in the resulting pattern?
A. 0.21 degrees
B. 3.6 × 10-3 degrees
C. 1.2 × 10-2 degrees
D. 4.8 × 10-2 degrees
Answer: A
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Comparing the densities of the Moon and Mercury, we find:
A) the Moon is slightly denser than Mercury. B) similar in surface appearance, they are also similar in density. C) that density increases as we go outward from the Sun. D) the Moon's is similar to Earth's crust, while Mercury's is similar to the entire Earth. E) both are much denser than our water-covered planet.
A radio station broadcasts at a frequency of 80 MHz. How far from the transmitter will this signal travel in 67 ms? (c = 3.0 × 108 m/s)
A) 60 × 106 m B) 67 m C) 40 km D) 80 km E) 20 × 106 m
A 10-A current flows for two minutes. (a) How much charge has passed through this circuit? (b) How many electrons have passed any point in the circuit?
What will be an ideal response?
One major difference between Young's double slit interference experiment with light and Jonsson's similar experiment with electrons is that