A light emitting diode (LED) emits blue light with a wavelength of 440 nm. The rate of photon emission is 3.0 × 10^16 s−1 . Show that the power output of the LED is approximately 0.014 W.

If somebody could provide a worked solution that would be fantastic as the mark scheme is quite vague and I am getting different values for the power output. Thanks!

If somebody could provide a worked solution that would be fantastic as the mark scheme is quite vague and I am getting different values for the power output. Thanks!

E=hf

E=hc/lambda

each photon has this amount of energy which you can calculate

so E ~4.5x10^-19J

and there are 3x10^16 photons released per second

so in one second

there are 3x10^16 photons released each with energy E

so total energy in one second (definition of power) = 3x10^16*E ~ 0.014W

E=hc/lambda

each photon has this amount of energy which you can calculate

so E ~4.5x10^-19J

and there are 3x10^16 photons released per second

so in one second

there are 3x10^16 photons released each with energy E

so total energy in one second (definition of power) = 3x10^16*E ~ 0.014W

Original post by mosaurlodon

E=hf

E=hc/lambda

each photon has this amount of energy which you can calculate

so E ~4.5x10^-19J

and there are 3x10^16 photons released per second

so in one second

there are 3x10^16 photons released each with energy E

so total energy in one second (definition of power) = 3x10^16*E ~ 0.014W

E=hc/lambda

each photon has this amount of energy which you can calculate

so E ~4.5x10^-19J

and there are 3x10^16 photons released per second

so in one second

there are 3x10^16 photons released each with energy E

so total energy in one second (definition of power) = 3x10^16*E ~ 0.014W

very helpful, thanks a lot mate! 😀

- A level Maths Mechanics: Connected particles
- I have a love-hate relationship with Physics.
- A-Level Physics Study Group 2024-25
- What topic is this A level mechanics maths question from?
- How can i improve my application for OXBRIDGE
- Should I apply to Cambridge?
- where can i find exam questions for gcse science ?? grade 9?
- Year 12 diaries: Becoming an Academic Nuclear Missile💯
- edexcel a-level physics struggle
- Simple Y13 GYG
- Astrophysics
- my Year 12 Adventure
- Isaac physics quantum mechanics primer difficulty level
- Mature student studying physics
- Difficulty of Physics A-Level
- Astrophysics - A level Physics
- What is a physics degree really like?
- I cant decide between studying Physics or Aerospace Engineering at uni
- weetabix_muncher's gyg blog
- How can i improve my application for oxford university

Latest

Trending