3 years ago

Which of the following is the smallest aperture (f-stop) opening?

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1 answer:

Firlakuza [10]3 years ago

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Answer:

E) f/16

Explanation:

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If a storm is 7.5 kilometers away, how much time is expected between observations of lightning and thunder? Round your answer to

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22.5 s is the correct answer to the given question .

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Given that

$d=7.5km=7.5\times 10^3 m$

For light:

We know that speed of light c

$c=3\times 10^8 m/s$

We know that

$Distance = Speed \times timed=C\time tt=\dfrac{D}{t}t=\dfrac{7.5\times 10^3}{3\times 10^8}\ st=2.5\times 10^{-5}st=0.025 ms$

For thunder :

Speed of sound ,v=332 m/s

$Time\ taken\ by\ sound \\t\’=\dfrac{7500}{332}=22.59 s$

Therefore the difference between time is given as follows

$\Delta t= t' - \ t=22.59-2.5\times 10^{-5}=22.59 s$

22.5 is the answer

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