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3 years ago

In what ways are red invasive fire ants costly?

2 answers:

8 0

All pesticidal approaches to kill the ants may be expensive<span> in time, equipment, or product </span>cost<span>.

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erastova [34]3 years ago

3 0

They destroy things that cost lots of money to repair, or they put people in hospitals, and that would cost a lot of money too.

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One of the three organisms depicted above can obtain energy through photosynthesis

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3 years ago

What is not a main principle of the cell theory?

Zanzabum

Answer: c not all cells have a nucleus (prokaryotic cells don’t)

Explanation:

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3 years ago

Unsaturated and saturated lipids exhibit different characteristic based on their structures wich characteristic is unique to sat

xz_007 [3.2K]

Answer:

I believe the answer is C.

Explanation:

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3 years ago

How does the structure of the bronchial tree change as the bronchi become smaller?

insens350 [35]

The following structural changes occur as conducting tubes become smaller;

- support structures change. The trachea has more hyaline cartilage than the bronchioles

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3 years ago

Read 2 more answers

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

Lady bird [3.3K]

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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3 years ago