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
Nana76 [90]
3 years ago
11

A 100-watt light bulb radiates energy at a rate of 100 J/s. (The watt, a unit of power or energy over time, is defined as 1 J/s.

) If all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?
Chemistry
1 answer:
Semmy [17]3 years ago
7 0

Answer

2.7956 * 10^19 photons

Givens

  • Wavelength = λ = 525 * 10^-9 meters  [1 nmeter = 1*10^-9 meters]
  • c = 3 * 10^8 meters
  • E = ???
  • W = 100  watts
  • t = 1 second
  • h= plank's Constant = 6.26 * 10^-34 J*s

Formula

E = h * c / λ

W = E / t

Solution

E = 6.26 * 10^-34 j*s * 3 * 10^8 m/s /525 * 10^-9 (m)

The meters cancel out. So do the seconds. You are left with Joules as you should be.

E =  3.577 * 10^-18 Joules

What you have found is the energy of 1 photon.

Now you have to find the Joules from the watts.

W = E/t

100 * 1 second = 100 joules

1 photon contains 3.577 * 10 ^ - 18 Joules

x photon = 100 joules                        

1/x = 3.577 * 10^-18 / 100                          Cross multiply

100 = 3.577 * 10 ^ - 18 * x                         Divide both sides by 3.577 * 10 ^ - 18

100/3.577 * 10 ^ - 18 = 3.577 * 10 ^ - 18x / 3.577 * 10 ^ - 18

2.7956 * 10^19 photons = x


You might be interested in
Isomers have the same physical properties because the chemical formulas are identical. True False
Luda [366]
The statement is False.
The molecular (chemical) formulas are same in case of isomers but the arrangement of atoms is different in them. The physical properties are determined by the arrangement of atoms within the molecule.

Since the arrangement of atoms is different in case of isomers, the Physical Properties will also be different.
5 0
3 years ago
100 points! Please help! Will give brainliest!!
patriot [66]
1- change of state (boiling)
2-increase in acidity
3-methylxanthines (caffeine) theobromine and theophylline
4- lemon juice
3 0
3 years ago
A hydrocarbon of pentane has two isomeric forms—n-pentane and iso-pentane. The molecular formula of the n-pentane is C5H12. Pred
Monica [59]
An iso pentane is an isomeric form of n-pentane. Isomers have same molecular formula but differ in the atomic arragement projected in 3D and the arrangement of atoms primarily resulting to a different set of properties. In this case, isopentane also has a molecular formula of an alkane <span>C5H12</span>
5 0
3 years ago
During which change of state do atoms lose energy
alexgriva [62]

Answer: Atoms lose energy as a gas changes to a solid.

Explanation:

6 0
2 years ago
Read 2 more answers
The anion of which element has a –1 charge?
vovangra [49]
An anion is a negatively charged ion. An element can become an anion if it takes an extra electron such that it has one more electron than protons.
Atoms would preferentially taken an extra electron so that it can have a full octet and be more stable.

\sf Cl^-, Br^-, F^- are some of the few elements that would have a -1 charge.
6 0
3 years ago
Other questions:
  • If fluorine 20 undergoes beta decay , what will it become ?
    11·1 answer
  • Molly made 3600 ml of tea for a party, and she served the tea divided equally in 12 cups. how many liters of tea did molly put i
    14·2 answers
  • Which scientist established the law of octaves?
    12·2 answers
  • An accounting report that shows the changes in capital during the accounting period is a/an
    5·2 answers
  • PLEASE HELP
    10·1 answer
  • While preforming an experiment involving colors and heat,Susan noticed that the black paper was warmer than the white piece of p
    15·1 answer
  • what is the boiling point of a 0.321 m aqueous solution of NaCl. Enter your rounded answer with 3 decimal places.
    5·2 answers
  • How do properties of waves affect light and sound
    6·1 answer
  • I NEED HELP RIGHT NOW
    11·1 answer
  • Can someone pleas help
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!