What is the wavelength, in meters, of light with an energy of 7.92x10-19 j? The value of Plank's constant, h, is 6.626x10-34 J s and the speed of light, c, is 2.998x108 m/s. The
formulas you will need: wavelength= speed of light/ frequency AND energy= plank's
constant x frequency.

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Ответ:

abigailguzman4108

17.09.2022

Chemistry

The mass of lead is 16.872 g

Explanation:

To calculate mass of a substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$ ......(1)

For Mercury:

Density of mercury = 13.6g/cm^3

Mass of mercury = 20.1 g

Putting values in equation 1, we get:

$13.6g/cm^3=\frac{20.1g}{\text{Volume of mercury}}\\\\\text{Volume of mercury}=1.48cm^3$

The volume of mercury is 1.48cm^3 which is equal to the lead sample.

For lead:

We are given:

Density of lead = 11.4g/cm^3

Volume of lead = 1.48cm^3

Putting values in equation 1, we get:

$11.4g/cm^3=\frac{\text{Mass of lead}}{1.48cm^3}\\\\\text{Mass of lead}=16.872g$

Hence, the mass of lead is 16.872 g

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What is the wavelength, in meters, of light with an energy of 7.92x10-19 j? The value of Plank's constant, h, is 6.626x10-34 J s and the speed of light, c, is 2.998x108 m/s. The formulas you will need: wavelength= speed of light/ frequency AND energy= plank's constant x frequency.