Original post by Acrux
A laser emits light of wavelength 635nm in beam of power 1.5mW. Calculate number of photons emitted per second?
Sorry, I didn't realise TSR was now called "The Someone Else Do My Homework Room".
What don't you understand with the question?
Original post by Mad Vlad
Sorry, I didn't realise TSR was now called "The Someone Else Do My Homework Room".
What don't you understand with the question?
What don't you understand with the question?
I got it know
with the mW do i multiply by 10^-3 why is this?
1.5x10^-3/3.1x10^-19
Original post by Acrux
I got it know
with the mW do i multiply by 10^-3 why is this?
1.5x10^-3/3.1x10^-19
with the mW do i multiply by 10^-3 why is this?
1.5x10^-3/3.1x10^-19
You have to get everything into common units. 1.5x10^-3 W is 1.5mW.
Original post by Mad Vlad
Sorry, I didn't realise TSR was now called "The Someone Else Do My Homework Room".
What don't you understand with the question?
What don't you understand with the question?
TSEDMHR really rolls off the tongue.
Original post by Smaug123
TSEDMHR really rolls off the tongue.
I thought so.
Original post by Mad Vlad
I thought so.
could you explain rest mass and rest energy to as level?
Original post by Acrux
could you explain rest mass and rest energy to as level?
could you explain rest mass and rest energy to as level?
Not without googling it (which I thoroughly recommend you do)... It's been 11 years since I did AS Physics.
Original post by Acrux
A laser emits light of wavelength 635nm in beam of power 1.5mW. Calculate number of photons emitted per second?
As you know the wavelength of the photons you also know their frequency.
You should know a formula with E, h (Plank's constant) and frequency f that gives you the energy of ONE photon of that wavelength.
When you know the energy of one you can work out how many you need (in a second) to get that 1.5mW
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