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iogann1982 [59]
2 years ago
12

A camper stands in a valley between two parallel cliff walls. He claps his hands and notices that the echo from the nearby wall

returns 0.9 s later while the echo from the farther wall returns 1.10 s later. If the air temperature is -10 C, how wide is the valley?
Physics
1 answer:
Stells [14]2 years ago
6 0
5,658 ft is your answer I believe
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An LED operation at 850 nm center wavelength has a spectral width of 45 nm. What is the pulse spreading in ns/km
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Answer:

\mathbf{\dfrac{\sigma_{mat}}{L} = 3.6 \ ns/ km}

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From the given information, the LED is operating with a given wavelength of 850 nm or 0.85 μm.

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a circuit has a total resistance of 5 ohms and a current of 0.3 amperes. What voltage must the battery supply?
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