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
zalisa [80]
3 years ago
12

A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 11 mA , and th

e LED is 51 % efficient at converting electric power input into light power output. How many photons per second does the LED emit?
Physics
1 answer:
zimovet [89]3 years ago
3 0

Answer:

3.73 * 10^16   photons/sec

Explanation:

power supply = 3.0 V

Emits 440 nm blue light

current in LED = 11 mA

efficiency of LED = 51%

<u>Calculate the number of photons per second the LED will emit </u>

first step : calculate the energy of the Photon

E = hc / λ

   =(  6.62 * 10^-34 * 3 * 10^8 )  / 440 * 10^-9

   = 0.0451 * 10^-17  J

Next :

Number of Photon =( power supply * efficiency * current ) / energy of photon

= ( 3 * 0.51 * 11 * 10^-3 ) / 0.0451 * 10^-17

= 3.73 * 10^16 photons/sec

You might be interested in
3. What are the forces present on the rope?​
irina1246 [14]

Answer:

The pulling force that acts along a stretched flexible connector, such as a rope or cable, is called tension, T. When a rope supports the weight of an object that is at rest, the tension in the rope is equal to the weight of the object: T = mg.

7 0
3 years ago
Please please help
Feliz [49]

Answer:

D

Explanation:

5 0
2 years ago
Describe the nature of sunlight using the following: wavelength, electromagnetic spectrum, visible light, photons.
kogti [31]

Answer:

due to the effect of gravity begins thermonuclear fusion processes, in these processes energy is released in the form of electromagnetic radiation

Explanation:

The Sun is a star of great size, which due to the effect of gravity begins thermonuclear fusion processes, in these processes energy is released in the form of electromagnetic radiation.

This radiation crosses the different layers of the Sun and escapes from it in the form of light that is emitted throughout the radiation spectrum, due to the temperature reached by the Sun about 5500K the most likely radiation is around 5500 nm corresponding to the green- yellow of the visible spectrum, but the entire spectrum is emitted with different intensity according to Stefan's law

     

In quantum mechanics this spectrum can also be analyzed as the emission of particles called photons, where each one is characterized by an energy and has a moment equal to zero, the energy of these photons is related to their frequency by the Planck equation

                   E = h f

3 0
3 years ago
How long would it take the Earth to complete 4 orbits around the Sun?
yuradex [85]

Each orbit is approximately 365.24 days ... the period we call a "year".

Four of those = 1,461 days  =  4 years .

6 0
4 years ago
Read 2 more answers
The amount of matter (mass) in a given unit volume
maxonik [38]

Answer:

Density is the mass of a substance per unit volume. Volume is the amount of space an object occupies.

Explanation:

6 0
4 years ago
Other questions:
  • What could be done to make present nonrenewable energy resources last longer??
    15·2 answers
  • Which statement about work and power correctly describes an automobile race?
    7·2 answers
  • Roleplay?????????????????
    12·2 answers
  • a baseball pitcher throws a fastball at 98 mph. he also has a slower "changeup" pitch, 75 mph, which he throws identically, same
    8·1 answer
  • Which of these is an autotroph?
    11·2 answers
  • Describe the shape of a straw in water​
    15·2 answers
  • The electric field in a certain region of Earth's atmosphere is directed vertically down. At an altitude of 439 m the field has
    8·1 answer
  • If a rock displaces 7 ml of water, what is the volume of the rock?
    8·1 answer
  • Help please it's worth a huge part of my grade!!
    11·1 answer
  • A planet's moon travels in an approximately circular orbit of radius 8.6 107 m with a period of 6 h 25 min. Calculate the mass o
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!