An x-ray tube accelerates electrons through a potential difference of 50.0 kV. If an electron in the beam suddenly give up its kinetic energy in a collision,
what is the shortest wavelength x-ray it could produce? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = 1.60 × 10-19 C)
2.48 × 10-11 m
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If a star system at 30 parsecs distance is found to be broadcasting intelligent radio signals, then their news is already ________ years old
Fill in the blank(s) with correct word
Two identical containers, A and B, hold equal amounts of the same ideal gas at the same Po, Vo and To. The pressure of A then decreases by a half while its volume doubles; the pressure of B doubles while its volume decreases by a half. Which statement correctly describes the temperatures of the gases after the changes?
A. TA = 0.5TB = To. B. TB = 0.5TA = To. C. TB = TA = To. D. TA = 2TB = To. E. TB = 2TA = To.
Which of the following is an "irreversible" process?
A) A block of wood sliding to a stop along a tabletop. B) A perfectly elastic ball that falls and rebounds from the floor back to its initial height. C) Both of the above. D) Neither of the above.
At what point in time is the current produced by the generator at its maximum?c
A. when the plane of the loop is vertical, in the same plane as the two magnetic poles B. when the plane of the loop is at 45? with respect to the line joining the two magnetic poles C. when the plane of the loop is horizontal, in the plane perpendicular to the line joining the two magnetic poles