Radio Interference. Two radio antennas A and B radiate in phase. Antenna B is 120 m to the right of antenna A . Consider point Q along the extension of the line connecting the antennas, a horizontal distance of 40 m to the right of antenna B . The frequency, and hence the wavelength, of the emitted waves can be varied. (a) What is the longest wavelength for which there will be destructive interference at point Q ? (b) What is the longest wavelength for which there will be constructive interference at point Q ?
Radio Interference. Two radio antennas A and B radiate in phase. Antenna B is 120 m to the right of antenna A . Consider point Q along the extension of the line connecting the antennas, a horizontal distance of 40 m to the right of antenna B . The frequency, and hence the wavelength, of the emitted waves can be varied. (a) What is the longest wavelength for which there will be destructive interference at point Q ? (b) What is the longest wavelength for which there will be constructive interference at point Q ?
Radio Interference. Two radio antennas A and Bradiate in phase. Antenna B is 120 m to the right of antenna A. Consider point Q along the extension of the line connecting the antennas, a horizontal distance of 40 m to the right of antenna B. The frequency, and hence the wavelength, of the emitted waves can be varied. (a) What is the longest wavelength for which there will be destructive interference at point Q? (b) What is the longest wavelength for which there will be constructive interference at point Q?
23.
What is the velocity of a beam of electrons that goes undeflected when passing through perpendicular electric and magnetic fields of magnitude 8.8 X 103 V/m and 7.5 X 10-3 T. respectively? What is the radius of the electron orbit if the electric field is turned off?
10.
A light bulb emits 25.00 W of power as visible light. What are the average electric and magnetic fields from the light at a distance of 2.0 m?
9.
Some 1800 years ago Roman soldiers effectively used slings as deadly weapons. The length of these slings averaged about 81 cm and the lead shot that they used weighed about 30 grams. If in the wind up to a release, the shot rotated around the Roman slinger with a period of .15 seconds.
Find the maximum acceleration of the shot before being released in m/s^2 and report it to two significant figures.
Chapter 35 Solutions
University Physics with Modern Physics, Volume 1 (Chs. 1-20) and Mastering Physics with Pearson eText & ValuePack Access Card (14th Edition)
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