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Anettt [7]
4 years ago
8

A laser pulse with wavelength 540 nm contains 4.85 mj of energy. how many photons are in the laser pulse?

Chemistry
1 answer:
gregori [183]4 years ago
4 0
The energy per photon can be calculated through this formula:

E = hc/λ
where
ħ is Planck's constant = 6.626x10⁻³⁴ J·s 
c is the speed of light = 3x10⁸<span> m/s </span>
<span>λ is the wavelength
</span>
The wavelength is given to be 540 nm or also equivalent to 540x10⁻⁹ m. Substituting the values,
E = (6.626x10⁻³⁴ J·s )(3x10⁸ m/s )/(540x10⁻⁹ m)
E = 1.681x10⁻¹⁹ J/photon

The total energy is given to be 4.85 mj or also equal to 4.85x10⁻³ J. Thus,

Number of Photons = 4.85x10⁻³ J/1.681x10⁻¹⁹ J/photon
<em>Number of Photons = 1.32x10¹⁶</em>
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sveta [45]
The answer is 209.15cm3

The volume is directly related to the temperature of a gas. You can solve this question using Charles' law, but remember to convert the temperature from Celcius to Kelvin.

V1/T1= V2/T2
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7 0
3 years ago
Which metals may be oxidized by H+ under standard-state conditions? Ag+(aq) + e– → Ag(s) E° = 0.80 V Cu2+(aq) + 2e– → Cu(s) E° =
Debora [2.8K]
Answer is: tin and zinc, because they standard potential as less than zero.
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8 0
3 years ago
The vapor pressure of water is 23.76 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in water is sucrose. Calculate
MrRissso [65]

Answer : The vapor pressure of solution is 23.67 mmHg.

Solution:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

\frac{p^o-p_s}{p^o}=\frac{w_2M_1}{w_1M_2}

where,

p^o = vapor pressure of pure solvent  (water) = 23.76 mmHg

p_s = vapor pressure of solution= ?

w_2 = mass of solute  (sucrose) = 12.25 g

w_1 = mass of solvent  (water) = 176.3 g

M_1 = molar mass of solvent (water) = 18.02 g/mole

M_2 = molar mass of solute (sucrose) = 342.3 g/mole

Now put all the given values in this formula ,we get the vapor pressure of the solution.

\frac{23.76-p_s}{23.76}=\frac{12.25\times 18.02}{176.3\times 342.3}

p_s=23.67mmHg

Therefore, the vapor pressure of solution is 23.67 mmHg.

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