A modern compact fluorescent lamp contains 1.4 mg of mercury. if each mercury atom in the lamp were to emit asingle photon of wa
2 answers:
Energy emitted : <u>3,0714 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:
fo = the threshold frequency of electromagnetic waves
Radiation energy is absorbed by photons
The energy in one photon can be formulated as
Where
E = energy of light, J
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves, Hz
f = c / λ
c = speed of light
= 3.10⁸
λ = wavelength
We determine the number of mercury atoms (Hg) in 1.4 mg
atomic mass Hg = 200
mass Hg = 1.4 mg = 1.4 .10⁻³g
mol Hg = mass: atomic mass
mol Hg = 1.4.10⁻³ g: 200
mol Hg = 7.10⁻⁶
Number of atoms: mole x Avogadro number
(1 mole = 6.02.10²³ particles)
number of atoms: 7.10⁻⁶ x 6.02.10²³
number of atoms: 4.214 x10¹⁸
Frequency of mercury rays:
f = c: λ
f = 3.10⁸: 254 .10⁻⁹
f = 1.1.10¹⁵
The radiation emitted by 1 mercury atom
E = h. f
E = 6,626.10⁻³⁴. 1.1.10¹⁵
E = 7.2886.10⁻¹⁹ J
So that the total energy
E total = 4,214.10¹⁸ .7.2886.10⁻¹⁹
E total = 3,0714 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
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Answer:
Molarity = 0.01 M
Explanation:
Molarity is used to measure the concentration of a solution. It will be same for the whole solution or a small amount of solution if the solution is homogeneous.
So, <u>Molarity of 200 mL of solution = Molarity of 50 mL of solution</u>
given mass of aspirin = 360 mg = 0.36 g
molar mass of aspirin = 180 g
Volume of solution = 200 mL = 0.2 L
Therefore, Molarity = 0.01 M