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
adoni [48]
3 years ago
7

The illuminance on a surface is 6 lux and the surface is 4 meters from the light source. What is the intensity of the source?

Chemistry
2 answers:
Elza [17]3 years ago
7 0

The correct answer is:

D.  96 candelas


Ghella [55]3 years ago
3 0

Answer: D. 96 candelas

Explanation: Illuminance is defined as the quantity of light incident on a surface per unit of area. It depends on the light’s intensity and its distance from the surface.

E=  illuminance on the surface (in lux)= 6 lux

I =  the intensity of the light from the source (in candelas) = ?

S= distance from the light source to the surface (in meters) = 4 m

E=\frac{I}{S^2}

I=E\times S^2

I=6\times (4)^2=96candela

You might be interested in
Calculate the mass, in grams, of cucl2 (mw = 134.452 g/mol) required to prepare 250.0 ml of a 6.11 % w/v cu2 (mw = 63.546 g/mol)
Sever21 [200]

6.11% w/v of Cu2+ implies that 6.11 g of Cu2+ is present in 100 ml of the solution

therefore,  250 ml of the solution would have: 250 ml * 6.11 g/100 ml = 15.275 g

# moles of Cu2+ = 15.275 g/63.546 g mole-1 = 0.2404 moles

1 mole of CuCl2 contain 1 mole of Cu2+ ion

Hence, 0.2404 moles of Cu2+ would correspond to 0.2404 moles of CuCl2

Molar mass of CuCl2 = 134.452 g/mole

The mass of CuCl2 required = 0.2404 moles * 134.452 g/mole = 32.32 grams

6 0
3 years ago
Soil texture is based on?
blsea [12.9K]
It is based on the water underground
3 0
3 years ago
When the drug heroin comes into contact with the Marquis reagent chemical what happens?
gtnhenbr [62]
When it comes into contact with It will turn purple
5 0
3 years ago
Read 2 more answers
Basically everything is in the picture, and i dont really understand please help.
zubka84 [21]
This is what I found

5 0
3 years ago
What intermolecular forces occur between two methane molecules?
nikklg [1K]
<span><span>Dipole-dipole interactions , example: ammoni </span><span>forces, example: methane, CH4</span><span>Hydrogen bonding example: water, H2O </span></span>
4 0
3 years ago
Other questions:
  • I have lived 2 centuries. How many minutes have I been alive? (use scientific notation pls)
    9·1 answer
  • Balancing Equations: <br> _(NH4)3PO4 + _Pb(NO3)4 = _Pb3(PO4)4 + _NH4NO3<br><br> With work please.
    14·1 answer
  • A solution with the concentration of 0.15 M is made using 8.00 grams of K2CrO4. How many milliliters of H2O should be used?
    6·1 answer
  • Which of the following is a noncontact force?
    11·2 answers
  • What data must you know about the isotopes of an element to calculate the atomic mass of the element?
    9·1 answer
  • A solid is cooled to a very low temperature. Assuming the mass remains constant, how, if at all, does this affect the density of
    13·2 answers
  • He free energy of a gas depends on __________. (select all correct answers) partial pressure of the gas van der waals constant f
    12·1 answer
  • Which statement about the sun's energy is correct?
    7·2 answers
  • What would u add if the soil is too basic~~ ?​
    6·2 answers
  • What is Chemical Bonding?<br>Explain please.​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!