1) A resistance R and a 1.5 -H inductance are in series across a 60-Hz ac voltag
ID: 2120170 • Letter: 1
Question
1) A resistance R and a 1.5-H inductance are in series across a 60-Hz ac voltage. The voltage across the resistor is 32 V and the voltage across the inductor is 20 V. Assume that all voltages in this problem are rms voltages.
(a) What is the resistance R?
? ohm
(b) What is the ac input voltage?
? V
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2) Light of wavelength 513 nm is used to illuminate normally two glass plates 23.9 cm in length that touch at one end and are separated at the other by a wire of radius 0.02mm. How many bright fringes appear along the total length of the plates.
? number of fringes
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Two small speakers are separated by a distance of 4 cm, as shown. The speakers are driven in phase with a sine wave signal of frequency 12 kHz. A small microphone is placed a distance 0.5 m away from the speakers on the axis running through the middle of the two speakers, and the microphone is then moved perpendicular to the axis. Where does the microphone record the first minimum of the interference pattern from the speakers as measured from the axis? The speed of sound in air is 343 m/s
? m (from axis)
And the first maximum?
? m (from axis)
PLEASE SHOW YOUR STEPS TO GET THE FINAL ANSWER!!!
Explanation / Answer
2. For a bright fringe 2t =(m+1/2)*lambda
t= 2r = 0.04mm
2 * 0.04mm /513 nm = m+0.5
m =156 fringes
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