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makkiz [27]
3 years ago
11

A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 503 nm, while the

power is 1.4 W. During surgery, the laser beam is turned on for 0.070 s. During this time, how many photons are emitted by the laser?

Chemistry
1 answer:
V125BC [204]3 years ago
4 0

Answer:

Number of proton emmitted by laser=2.48*10^17proton

Explanation:

Energy is the ability to cause change; power is directly proportional to energy and its the rate energy is utilized.

Power=energy/time.

First we need to calculate the total energy used which is equal to the total power utilized.

E(total)= P( total) = 1.4W × 0.070 s =0.098J

CHECK THE ATTACHMENT FOR THE REMAINING DETAILED CALCULATION

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Calculate number of grams in 1.15*10^21 molecules of P2O5
Vlada [557]
To go from molecules, we first need to convert to moles and then convert to grams.

To convert from molecules to moles, we need to divide by Avogadro's constant.

1.15*10^21 molecules * (1 mole/6.022*10^23 molecules) = 0.0019097 moles

To convert from moles to grams, we need to use the molar mass.

The molar mass of P₂O₅ is (2*30.98)+(5*16.00) = 141.96
You can find the molar mass using the periodic table.

0.0019097 moles * (141.96 grams/1 mole) = 0.2711 grams.

Since we have 3 significant digits in 1.15*10^21, that means our final answer is limited to 3 significant digits.

Your final answer is 0.271 grams.
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An electric current can be best conducted by
Licemer1 [7]

Answer:

a metal

Explanation:

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3 years ago
Is water wet? My friends are debating.​
romanna [79]

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No

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There are several aromatic compounds with the formula C8H9Cl. Draw those that have a trisubstituted ring where the methyl groups
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Answer:

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4-Chloro-1,2-dimethylbenzene

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