Why is it impossible to generate radio waves with a frequency of 4 × 10^14 Hz?
An LC circuit cannot be made small enough for this frequency.
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A top is set spinning so that the rotation is counterclockwise around its axis when viewed from above. When the top is placed on a level surface it happens that its axis of rotation is not quite vertical. Viewed from above, which way does the rotational axis of the top precess?
a. clockwise b. counterclockwise c. It's random, if it starts clockwise it will continue clockwise, and vice versa, i.e., a 50% chance either way. d. The direction depends on the little shove given to the axis when the top is placed on the surface. e. In the northern hemisphere it will be clockwise, in the southern hemisphere it will be counterclockwise.
A camera used for aerial surveillance has a lens with a 30-cm maximum aperture and a 42-cm focal length. Assume light of 550-nm wavelength is used and that the resolution of the camera is limited solely by diffraction
What is the angular resolution of the camera at maximum aperture? A) 1.6 µrad B) 2.2 µrad C) 3.2 µrad D) 4.5 µrad E) 6.3 µrad
When the principal quantum number is n = 5, how many different values of ? are possible?
1.1 2.5 3.9 4.25
Bulk Modulus: A piece of iron sinks to the bottom of a lake where the pressure is 21 times what it is at the surface. Which statement best describes what happens to the density of that piece of iron?
A. There has been no change in the density of the iron. B. Its density decreases slightly. C. Its density increases slightly. D. Its density becomes 21 times greater than what it was at the surface. E. Its density becomes 1/21 what it was at the surface.