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
The diagram below represents an electromagnetic wave. Please Help<br>​
forsale [732]

Answer:

I'm pretty sure it's A

Explanation:

bc the crest is is the point on the wave

8 0
3 years ago
What is one of the earliest ways that ancient peoples produced light?
VARVARA [1.3K]

Answer:

Candles

Explanation:

The answer is the first option or "candles." In ancient times the people would lit candles and place them in difference places in their homes, temples, etc... to produce light. It's not option B because light emitting diodes are used to light up toys and such which weren't invented in ancient times. It's not option C because fluorescent bulbs  are long light bulbs used to light up huge spaces without as many light bulbs which were again not invented at the time, and it's also not option D because incandescent bulbs are you usual light bulbs which weren't invented at the time.

Hope this helps.

4 0
3 years ago
What types of waves make up the electromagnetic spectrum?
vova2212 [387]
Gamma rays, x-rays, ultraviolet, infrared, microwaves and radio waves<span>. Together with visible light, all these </span>types<span> of radiation </span>make up<span> what we call the </span>electromagnetic spectrum<span> </span>
4 0
3 years ago
Read 2 more answers
Explain why light bends as it enters a glass block
asambeis [7]

It is called <em>refraction</em> and is caused the the clear surface bending the light to make it appear different colors or look like it is bent.

4 0
3 years ago
Two children stand on a platform at the top of a curving slide next to a backyard swimming pool. At the same moment the smaller
IgorC [24]

Answer:

Explanation:

i )

In a conservative field like gravitational field , loss of potential energy  or work done , depends upon the initial and final point and not the manner in which 2 nd point has been reached . Since the initial and final point is same in both the cases of straight and curved path , final velocity will remain same for both of them .

Hence , due to increased mass of larger child , his kinetic energy will be greater .

ii ) Since the initial and final point is same in both the cases of straight and curved path , final velocity will remain same for both of them .

iii ) Smaller child undergo free fall , therefore , he will fall with acceleration g . The larger child falls on curved path . So , he will have only a component of

vertical g at any moment  . hence average acceleration  will be less.

6 0
3 years ago
Other questions:
  • Consider a traveling wave described by the formula
    13·1 answer
  • Frankie and carol are playing tug a war using a rope . if frankie , on the right , pulls with the force of 7n what force is caro
    8·1 answer
  • A person with his ear to the ground, sees a huge stone strikethe concrete pavement. A moment later two sounds are heard from the
    6·1 answer
  • Which energy conversion takes place when a solar cell is used to light a street lamp?
    13·2 answers
  • Reviewing Interactive Solution 5.46 will help in solving this problem. A stone is tied to a string (length = 0.551 m) and whirle
    7·1 answer
  • How is the density of a material determined?
    9·1 answer
  • When a board with a box on it is slowly tilted to a larger and larger angle, common experience shows that the box will at some p
    7·1 answer
  • A football that is inflated inside and taken outdoors on a winter day shrinks slightly. What are the two variables that are in t
    9·1 answer
  • What is the temperature of air if the speed of sound is 295m/s?​
    10·1 answer
  • A car goes down a straight, horizontal road at 24.0 m/s. How many minutes will the car take to travel 18.0 km? (a) 10.0 min I (b
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!