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Ad libitum [116K]
3 years ago
11

Which describes how to generate a real image of an object using a concave mirror?The object must be closer to the mirror than th

e focal point.
The object must be placed behind the mirror.
The object must be farther from the mirror than the focal point.
Physics
1 answer:
iren2701 [21]3 years ago
7 0
In order to form a real image using a concave mirror, the object must be placed beyond the center of curvature of the mirror. Therefore, the object must be further from the mirror than the focal point. The image that will form will be real, but it will also be inverted and its magnification will be less than 1, meaning it will be smaller than the actual object.
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Answer:

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A pipe that is open at both ends has a fundamental frequency of 320 Hz when the speed of sound in air is 331 m/s.
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Question

What is the length of the pipe?

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(b) f2=640 Hz and f3=960 Hz

(c) 352.9 Hz

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v=\frac {2Lf}{n}

Making L the subject then

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L=\frac {1*331}{2*320}=0.5171875\approx 0.52m

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f2=2fi

f3=3fi

f2=3*320=640 Hz

f3=3*320=960 Hz

Alternatively, f2=2\times \frac {v}{2L} and f3=3\times \frac {v}{2L}

f2=2\times \frac {331}{2*0.52}=636.5 Hz\\f3=3\times \frac {331}{2*0.52}=954.8 Hz

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When v=367 m/s then

f1= \frac {v}{2L}\\f1= \frac {367}{2*0.52}=352.9 Hz

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