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3 years ago

HELP PLS FOR BRAINLEST...

Chemistry

2 answers:

Andrew [12]3 years ago

8 0

Answer:

Explanation:

IrinaK [193]3 years ago

4 0

B!!!!!!!!:)))))))))))((((

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which statement regarding the relative energies of monochromatic light with with λ = 800 nm andmonochromatic light with λ = 400

olga2289 [7]

Answer:

The correct answer is option A.

Explanation:

Energy of the photon of an electromagnetic radiation is give by Planck's equation:

$E=\frac{hc}{\lambda }$

Where:

h = Planck's constant

c = speed of light

$\lambda$ = Wavelength of the photon's radiation

Energy of photon of 800 nm monochromatic light

$\lambda = 800 nm=400\times 10^{-9} m$

$E=\frac{hc}{800 \times 10^{-9} m}$

Energy per mole of photons:

$E\times N_A=\frac{hc}{800 \times 10^{-9} m}\times 6.022\times 10^{23} mol^{-1}$ ..[1]

Energy of photon of 400 nm monochromatic light

$\lambda '= 400 nm=400\times 10^{-9} m$

Energy per mole of photons:

$E'\times N_A=\frac{hc}{400 \times 10^{-9} m}\times 6.022\times 10^{23} mol^{-1}$ ..[2]

[1] ÷ [2]

$\frac{E\times N_A}{E'\times N_A}=\frac{\frac{hc\trimes 6.022\times 10^{23} mol^{-1}}{800 \times 10^{-9} m}}{\frac{hc\times 6.022\times 10^{23} mol^{-1}}{400 \times 10^{-9} m}}$

$\frac{E}{E'}=\frac{1}{2}$

$E=\frac{1}{2}\times E'$

8 0

3 years ago

Read 2 more answers

Help me with questions 1-8. here's the link to the textbook

Ede4ka [16]

Answer:

7 gmkrjfjrjgfhgh

Explanation:

bc I'm dum

6 0

3 years ago

6th grade science. Help me please !! :))

Airida [17]

Answer:

Explanation:

i think he enjoyed the drums because it said he played in different bands

5 0

3 years ago

What mass of nitrous oxide gas (N2O) is contained in 40.0 L balloon at a pressure of 130.0 kPa and a temperature of 25 °C?

tamaranim1 [39]

The mass of the N₂O in the given question is 92.4g.

<h3>What is the moles of N2O in the given conditions?</h3>

STEP1- Apply the ideal gas equation

PV=nRT

STEP2- Put the given values in the equation

P=130kPa, T=298K, V=40L R=8.31

STEP3- Solve the equation

N=PV/RT,

N=130×40/8.31×298

N=2.1moles

N=mass/molecular mass

mass=2.1×44

mass = 92.4g

Hence, the mass of N₂O is 92.4g.

learn more about ideal gas.

brainly.com/question/25290815

#SPJ1

7 0

2 years ago

Rachel loves gardening. This summer, her 10 ft x 10 ft garden space is divided equally among tomatoes, lettuce, and strawberries

Ray Of Light [21]

Answer:

Rachel needs 0.52 kg of fertilizer.

Explanation:

Since the surface is a <em>square</em> of 10 ft of size its area is A = 10 ft x 10 ft = 1.0 x 10² ft². <em>One third</em> of that space is devoted to tomatoes (<em>"space is divided equally among tomatoes, lettuce, and strawberries"</em>), that is, 1/3 x 100 ft² = 33 ft².

We calculate the kilograms of fertilizer required we need to know 2 equivalences:

1 ac = 43,560 ft²

1 lb = 0.4535 kg

Then, we can use proportions to find out the amount of fertilizer used:

$33ft^{2} \frac{1ac}{43,560ft^{2} } .\frac{1,500lb}{1ac} .\frac{0.4535kg}{1lb} =0.52kg$

7 0

3 years ago