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
Leto [7]
3 years ago
10

A laser pulse with wavelength 520 nm contains 4.40 mj of energy. how many photons are in the laser pulse?

Physics
1 answer:
Vilka [71]3 years ago
3 0
Given:
λ = 520 nm = 520 x 10⁻⁹ m, the wavelength
E = 4.4 mJ = 4.4 x 10⁻³ J, energy per packet or pulse

The Planck-Einstein equation is
E = (hc)/λ
where
c = 3 x 10⁸ m/s, the velocity of light

The energy per photon is
e = fh
where 
f = c/λ = 3 x 10⁸/520 x 10⁻⁹ = 5.7692 x 10¹⁴ 1/s

The number of photons is
E/e = c/(fλ)
      = (3 x 10⁸)/[(5.7692 x 10¹⁴)*(520 x 10⁻⁹)]
      = 1

Answer:  1
You might be interested in
Why do we see different colors of white light if white light is what is shining down from the sun?
oee [108]

Answer:Hope this helped.

Explanation:

Because each color is refracted differently, each bends at a different angle, resulting in a fanning out and separation of white light into the colors of the spectrum. Water droplets in the air can act in a manner similar to that of a prism, separating the colors of sunlight to produce a spectrum known as a rainbow.────(♥)(♥)(♥)────(♥)(♥)(♥) __ ɪƒ ƴσυ'ʀє αʟσηє,

──(♥)██████(♥)(♥)██████(♥) ɪ'ʟʟ ɓє ƴσυʀ ѕɧα∂σѡ.

─(♥)████████(♥)████████(♥) ɪƒ ƴσυ ѡαηт тσ cʀƴ,

─(♥)██████████████████(♥) ɪ'ʟʟ ɓє ƴσυʀ ѕɧσυʟ∂єʀ.

──(♥)████████████████(♥) ɪƒ ƴσυ ѡαηт α ɧυɢ,

────(♥)████████████(♥) __ ɪ'ʟʟ ɓє ƴσυʀ ρɪʟʟσѡ.

──────(♥)████████(♥) ɪƒ ƴσυ ηєє∂ тσ ɓє ɧαρρƴ,

────────(♥)████(♥) __ ɪ'ʟʟ ɓє ƴσυʀ ѕɱɪʟє.

─────────(♥)██(♥) ɓυт αηƴтɪɱє ƴσυ ηєє∂ α ƒʀɪєη∂,

───────────(♥) __ ɪ'ʟʟ ʝυѕт ɓє ɱє.

5 0
3 years ago
Read 2 more answers
HELP!!! What role might electrostatic force play in spider dispersal, according to a recent study?
Marat540 [252]

The positively charged atmosphere attracts negatively charged spider silk, might electrostatic force play in spider dispersal, according to a recent study.

Answer: Option C

<u>Explanation:</u>

The positive charge present in upper of the atmosphere and the negative charge on planet’s surface. During cloudless skies days, the air possesses a voltage of nearly around 100 volts for each and every meter from above the ground.

Ballooning spiders process within this planetary electric field. When their silk relieve their bodies then it picks up a negative charge. This oppose the similar negative charges on the surfaces on which the spiders settles and create sufficient force to lift them into the air. And spiders can hike those forces by climbing onto blades of grass,twigs, or leaves.

6 0
3 years ago
What is the universe made of?​
RoseWind [281]

Answer:

Composition. The universe is composed almost completely of dark energy, dark matter, and ordinary matter. Other contents are electromagnetic radiation (estimated to constitute from 0.005% to close to 0.01% of the total mass-energy of the universe) and antimatter.

Explanation:

your answer

4 0
3 years ago
Using a simple machine, a student is able to lift a 500N weight by applying only 100N.
pishuonlain [190]
Hey there!

a \ student  \ is \ able \ to \ lift \ a \ 500(n) \\ weight \ by \ applying \ only  \ 100(n) \\ \\ so, \ this \ info \ here, \ we \ simply \ divide \ by \\ how \ much \ this \ kid \ lifted, \ by \ the \ weight \ he/she \\ \ is \ applying. \\ \\   \left[\begin{array}{ccc}\boxed{\boxed{500(n)/100(n)}}\end{array}\right] \\ \\ and \ from \ this,\ your \ answer \ would \ \\ conclude \ to \ be \ (5) \\ \\ \boxed{5} \ would \ be \ your \ answer!

Hope this helps you!
7 0
3 years ago
Cho mạch như hình vẽ E
labwork [276]

Answer:

A

Explanation:

8 0
2 years ago
Other questions:
  • What time does the full moon rise? A. About Sunrise B. About Noon C. About Sunset D. About Midnight
    9·2 answers
  • How can naural gas be manged so that we dont run out
    15·1 answer
  • What is the relationship between the kinetic energy of molecules in an object and the object temperature
    6·1 answer
  • Define temperature<br> define absolute zero
    9·1 answer
  • Beet or cabbage juice can be used as:
    14·2 answers
  • Question is linked below! BRAINLIEST rewarded to the first person to answer!!
    11·1 answer
  • Does toothpaste have matter
    14·1 answer
  • A 5.0 kg block is pushed 2.0 m at a constant velocity up a vertical wall by a constant force applied at an angle of 26
    9·1 answer
  • A/An _____________ ( wind vane / anemometer ) can be used to measure wind speed.
    12·1 answer
  • Need help with this one question!​
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!