Shithawks

Flatmates are all away on various trips and I’m left on my own bored~ so…

Photons = represent particles of light (or other electromagnetic radiation, i.e microwaves, x-rays)

Your question:

“find the wavelength in cm of light whose frequency is 7.00 x 10^16 Hz”

c = speed of light = 2.988×10^8 m/s
v = frequency = 7.00 x 10^16 Hz
λ = wavelength = ?

Presents the formula:

c = λv

Step one, re-arrange formula so that wavelength (λ) is the unknown:

λ = c/v

Apply the values. (if you have MHz or anything else always convert it to Hz (Hz is the same as s-1 which helps in cancelling out units -you’ll see what I mean)

λ = 2.998×10^8 m s -1 / 7.00×10^16 s-1

remember to cancel out the units leaving m so:

λ = 4×10^-9 m

Convert that to cm – I didn’t understand this – normally you would convert it to nanometers, or nm – as 4×10^-9 m = 4nm.

…but here we go:

λ = 4×10^-7cm

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“how many joules of energy are there in one photon of yellow light whose wavelength is 630nm?”

Well, since my new calculator and I have fallen out, I’ll tell you how to do this one but won’t do the calculations – it’s relatively easy and will reinforce the shit we did in the last question.

- to find out how many joules of energy is in one photon, we use the equation:

E=hv

E = energy of a particle of light
h = the Planck constant = 6.626×10^-34
v = frequency

As you can see we haven’t been given frequency to work that shit out, but we do know we can find it using the previous equation c = λv

so fumble around with the equation to find the frequency, remember to convert nanometers into meters and do that shit. If you get confused, PM me

Next part, after we have retrieved the frequency, we perform ‘E=hv’

so basically fill it in, and remember to cancel out units, so it should leave you with the answer in Joules.

I’m perched on my bed, my head on a pillow, about to scribble frantically in my notebook – this very notebook – an account of my time so far in employment, in one of the local stores around this area. It’s around half past 12 to quarter to 1 in the morning and I’m not planning on going to sleep for at least another hour or so – I start at 9am later, which by all verdicts is a reasonable enough time, so I’m not protesting against it.

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