PHYS 202 Midterm: PHYS 202 TAMU s07 Exam 4 Solutions
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Note: the speed of light in air is c = 3. 00 x 108 rn/s. No work need be shown and no partial credit wifi be given. (5 pts) 1. Two antennas a and b emit coherent electromagnetic waves of frequency. Initially, the interference at point f, 80. 0 m from antenna a, is constructive. Then antenna a is slowly moved toward f, while the location of antenna b is unchanged. How far has a moved toward p when the interference at p first becomes destructive? (a) 2. 0 m (b) 3. 0 m c6. 0 (d 9. om (e) 12. 0 m (f) 18. 0 m (g) none of these answers (5 pts) 2. Light of wavelength 300 urn shinning on a metal surface produces photoelectrons with maximum kinetic energy 2. 0 ev. If the wavelength of the light is decreased while the intensity of the light is kept the same, the maximum kinetic energy of the photoelectrons will (a) stay the same (b) decrease (5 pts) 3.
