James is listening to the same tone coming from two speakers, one 3.49 m away and the other 3.10 m distant. At his position the two tones destructively interfere
(a) What is the largest possible wavelength of the tone?
(b) If the air temperature is 30.°C, what is the lowest possible frequency?
(a) 0.78 m
(b) 0.45 kHz
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Double-Slit Interference: Two radio antennas are 130 m apart on a north-south line. The two antennas radiate in phase at a frequency of 3.6 MHz. All radio measurements are made far from the antennas. What is the smallest angle, reckoned east of north from midway between the antennas, at which constructive interference of two radio waves occurs? (c = 3.00 × 108 m/s)
A. 50° B. 55° C. 45° D. 40° E. 35°
A star has an hour angle of +4 hours. What can you conclude?
A) The star remains above your horizon for only 4 hours each day. B) The star crossed your meridian 4 hours ago. C) The star remains below your horizon for only 4 hours each day. D) The star crosses your meridian at 4 a.m. each day. E) The star crosses your meridian at 8 p.m. each day.
The diffraction limit is a limit on:
A. A telescope's size. B. A telescope's angular resolution. C. A telescope's spectral resolution.
The circuit below shows three resistors in series. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest
a.
E3 < E2 < E1.
b.
E2 < E1 = E3.
c.
E1 = E2 = E3.
d.
E1 = E3 < E2.
e.
E1 < E2 < E3.