Answer : The density of an object is,
Solution : Given,
Mass of an object = 60 g
Volume of an object =
Formula used :
Now put all the given values in this formula, we get the density of an object.
Therefore, the density of an object is,
Calculate the energy for one mole of photons (an einstein) for light absorbed at 6.90 × 102 nm.
2 answers:
The energy for one mole of photons : <u>1.7343.10⁵ J</u>
<h3>Further explanation </h3>The photoelectric effect is an electron coming out of a metal because of electromagnetic radiation
One type of electromagnetic radiation is light
Electrons can come out of metal because they absorb electromagnetic energy radiated on metals. There is also kinetic energy released from metal, which is according to the equation:
<h3> E = hf - hfo </h3>fo = the threshold frequency of electromagnetic waves
Radiation energy is absorbed by photons
The energy in one photon can be formulated as
<h3> E = h. f </h3>
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
f = c / λ
c = speed of light
= 3.10⁸
λ = wavelength
Known wavelength 6.90 × 10² nm
6.90 × 10² nm. = 6.9.10⁻⁷ m
We put it in the formula to find this light energy E = h. f
Because this is 1 photon energy, while the number of photons in one mole = 6.02.10²³, then the energy for one mole of photons
2.88 .10⁻¹⁹ x 6.02.10²³ = 1.7343.10⁵ J
<h3>Learn more </h3>
Electromagnetic radiation with wavelength of 745 nm
The energy of a photon
The equation E = hf
the approximate energy of a photon
The equation for photon energy
the wavelength of a photon whose energy is twice
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Explanation:
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