1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Maksim231197 [3]
3 years ago
9

When electromagnetic radiation of wavelength 300nm falls on the surface of sodium electrons are emitted with a KE of 1.68 * 10 5

J mol ​-1 .what is the minimum energy needed to remove an electron from sodium?what is the maximum wavelength that will cause a photoelectron to move
Chemistry
2 answers:
Fantom [35]3 years ago
7 0

3.83 × 10⁻¹⁹

this is the answer because you have to

find the energy of the proton

gtnhenbr [62]3 years ago
6 0

Answer:

3.83 × 10⁻¹⁹ J;  518 nm  

Step-by-step explanation:

The equation for the <em>photoelectric effect</em> is

hf = Φ + KE  

<em>Data: </em>

λ = 300 nm = 300 × 10⁻⁹ m

KE = 1.68 × 10⁵ J/mol

Calculations:

Part 1. Minimum energy to remove an electron

(a) Calculate the <em>energy of the photon</em>

fλ = c  

 f = c/λ     Divide each side by λ

E = hf

E = hc/λ

E = (6.626× 10⁻³⁴ × 2.998 × 10⁸)/(300 × 10⁻⁹)

E = 6.622 × 10⁻¹⁹ J

(b) Calculate the <em>KE of one electron</em>

KE = 1.68 × 10⁵ × 1/(6.022 × 10²³)

KE = 2.790 × 10⁻¹⁹ J

(c) Calculate the work function

hf = Φ + KE     Subtract KE from each side

Φ = 6.622 × 10⁻¹⁹  - 2.790 × 10⁻¹⁹

Φ = 3.83 × 10⁻¹⁹ J

The minimum energy to remove an electron from a sodium atom

is 3.83 × 10⁻¹⁹ J.

Part 2. Maximum wavelength to remove an electron

The photon must have just enough energy to overcome the work function and leave the electron with zero kinetic energy.

    E = Φ

hc/λ = Φ                      Multiply each side by λ

  hc = Φ λ                   Divide each side by Φ

   λ = hc/ Φ

   λ = (6.626 × 10⁻³⁴ × 2.998 × 10⁸)/(3.83 × 10⁻¹⁹)

   λ = 5.18 × 10⁻⁷ m     Convert to nanometres

   λ = 518 nm

The maximum wavelength that will cause an electron to move is 518 nm.

You might be interested in
What is melted rock and minerals found below earths crust
nordsb [41]
Melted rock and minerals below the earth's crust is also known as magma
6 0
3 years ago
Carbon exists in nature as three isotopes. Given the atomic masses and relative abundance of the isotopes, what is the average a
Ivan

The most abundant carbon isotope is carbon-12.

The relative atomic mass of carbon is 12.011, which is extremely close to 12.0. This means that the masses C-13, and C-14 are practically negligible when contributing to the relative atomic mass of carbon.

the C-12 isotope makes up 98.9% of carbon atoms, C-13 makes up 1.1% of carbon atoms, and C-14 makes up just a trace of carbon atoms as they are found in nature.

6 0
3 years ago
How is Carbon returned to the atmosphere<br><br>Please help image below​
Harrizon [31]

Answer:

Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.Humans play a major role in the carbon cycle through activities such as the burning of fossil fuels or land development.

8 0
2 years ago
Read 2 more answers
What happens to<br> carbon dioxide?
Molodets [167]
Moves from the atmosphere to the oceans
3 0
2 years ago
Read 2 more answers
When HBr is added to pure water, HBr molecules lose protons, while water molecules gain protons. In this reaction, HBr is a(n)
Stells [14]
Acid Sorry if I am wrong but I am pretty positive it’s acid
3 0
3 years ago
Other questions:
  • Moist to wet as warm is to:<br><br> Luke<br> Boiling or<br> Steamy
    14·1 answer
  • A mothball, composed of naphthalene (c10h8), has a mass of 1.64 g . part a how many naphthalene molecules does it contain?
    7·1 answer
  • grandma baked cookies. she gave 7 to sandy. she gave half of what were left, plus one to sue. she gave 3 to stan. then she gave
    8·1 answer
  • Describe the best way Ryan can increase the rate of dissolving of lead (II) chloride in a solution.
    7·2 answers
  • Which element has the strongest attraction for electrons?
    13·1 answer
  • What is true of a solution of 1.0M HCL
    11·1 answer
  • a few drops of perfume were spilt on the floor a few minutes later ghe perfume could be smelt a few meters away what 2 processes
    15·1 answer
  • Can someone help me pls.
    8·1 answer
  • One of the main components of an airbag is the gas that fills it. As part of the design process, you need to determine the exact
    9·2 answers
  • What makes up a compound
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!