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Andrew [12]
3 years ago
13

A laser pulse with wavelength 555 nm contains 4.40 mj of energy. how many photons are in the laser pulse?

Chemistry
1 answer:
Diano4ka-milaya [45]3 years ago
5 0

Wavelength is the ratio of speed of light and frequency:

wavelength = speed of light / frequency 

where frequency is: (c is speed of light)<span>
freq = c / wavelength = 3E8/550E-9 = 5.45E14 Hz 

We know that photons have energy E = hf = 6.626E-34 Js * 5.45E14 Hz = 3.61 E-19 J 

Therefore if it has 4.40 mJ of energy, the pulse has: 
<span>4.40E-3/3.61E-19 = 1.22E16 photons</span></span>

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Answer:

Everything is composed of atoms! which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass.

Explanation:

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NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a
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λ = 0.0167 m = 16.7 mm

Explanation:

The wavelength of these radio waves can be found out by using the formula for the speed of radio waves:

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How many moles of sulfur dioxide are in 2.26x10^33 sulfur dioxide molecules?
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Answer:moles = no. of molecules / Avogadro's number

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Use the value of the Avogadro constant (6.02 × 1023 mol–1) to calculate the total number of atoms in 7.10 g of chlorine atoms. (
kolbaska11 [484]

The total number of atoms in 7.10g of chlorine is 1.204 × 10²³atoms.

HOW TO CALCULATE NUMBER OF ATOMS:

  • The number of atoms in a substance can be calculated by multiplying the number of moles in that substance by Avogadro's number as follows:

  • no. of atoms = no. of moles × 6.02 × 10²³ mol-¹

  • The number of moles in 7.10g of Cl is calculated as follows:

no. of moles = mass ÷ molar mass

no. of moles = 7.10g ÷ 35.5g/mol

no. of moles = 0.2mol

no of atoms = 0.2mol × 6.02 × 10²³

no. of atoms = 1.204 × 10²³atoms.

  • Therefore, the total number of atoms in 7.10g of chlorine is 1.204 × 10²³atoms.

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