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Vlada [557]
3 years ago
6

A photon of light produced by a surgical laser has a wavelength of

Chemistry
1 answer:
krok68 [10]3 years ago
3 0

Answer:

E =  0.024 ×10⁻¹⁷ J

Explanation:

Given data:

Wavelength of photon = 821 nm (821 ×10⁻⁹ m)

Energy of photon = ?

Solution:

Formula:

E = hc/λ

h = plancks constant = 6.626×10⁻³⁴ Js

c = speed of light = 3×10⁸ m/s

by putting values

E = 6.626×10⁻³⁴ Js × 3×10⁸ m/s / 821 ×10⁻⁹ m

E = 19.878×10⁻²⁶ J.m/ 821 ×10⁻⁹ m

E =  0.024 ×10⁻¹⁷ J

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lisabon 2012 [21]
The answer is B. is the energy source of stars.

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Answer:

4

Explanation:

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3 years ago
Which would exert more pressure on the floor, a 100kg man wearing snow shoes or a 60kg woman wearing high heels? PLEASE EXPLAIN
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Pressure can be defined as the force acting on a perpendicular surface per unit area.

Force exerted by a man of mass 100 kg wearing snow shoes = m.a

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Force exerted by 100 kg man is greater than that exerted as 60 kg woman. The area on which this force is acting determines the pressure. Pressure is inversely proportional to the area on which the force acts. Therefore, the pressure exerted by 100 kg man wearing snow shoes is less than the pressure exerted by a 60 kg woman woman wearing high heels as the force acts over a larger area when the man wears snow shoes when compared to the force exerted over a smaller area in case of the woman wearing high heels.

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3 years ago
Which of the following best describes an ecosystem in a California tide pool?
frosja888 [35]

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Select the correct answer from each drop-down menu.
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The arrow shows that the bond between the chlorine atom and the fluorine atom is nonpolar. The electrons in the bond are pulled more strongly by the fluorine atom, and the chlorine atom is slightly positive.

Explanation:

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