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Crazy boy [7]
3 years ago
14

Brianliest question! ♥ Ben was conducting an experiment on the growth of pea plants Ben added fertilizer to some plants and no f

ertilizer to others. He made several observations about the plants as they were growing.
Quantitative data or observations mean that you measure something. Which observation made by Ben is quantitative?
A) Each pea pod grew 5 centimeters in a week.
B) The pea plants that were given fertilizer grew taller.
C) The pea plants that received fertilizer were greener.
Biology
1 answer:
Tcecarenko [31]3 years ago
5 0
A is the correct answer!
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An owl has good night vision because its eyes can detect a light intensity as small as 5.0 × 10-13 W/m2. What is the minimum num
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Answer:

Thus, the minimum number of photons per second is 77.34

Explanation:

Light intensity, I_{min} =  5\times 10^{-13} W/m^{2}

Pupil has a diameter, d = 8.5 mm

                                      = 8.5 x 10^{-3} m

Radius of the eye, r = 4.25 x 10^{-3} m

∴ Area of the eye, A = \pi .r^{2}

                                 = 3.14\times \left ( 4.25\times 10^{-3} \right )^{2}

                                = 5.6\times 10^{-5} m^{2}

Let P_{min} be the minimum number of photons.

Therefore, P_{min} = I_{min} x A

                                              = 5\times 10^{-13} x 5.6\times 10^{-5}

                                             = 2.8\times 10^{-17} W

Thus the minimum number of photons is given by

N_{min}=P_{min}/E

where E = hc/\lambda

             = \left (6.63\times 10^{-34}\times 3\times 10^{8}  \right )/548\times 10^{-9}

            = 3.62\times 10^{-19} J

Therefore, N_{min} = \frac{2.8\times 10^{-17}}{3.62\times 10^{-19}}

                                              = 77.34 photons per second

Thus, the minimum number of photons per second is 77.34

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