1. a 0.828-nm photon collides with a stationary electron. after the collision, the electron moves forward and the photon recoils backwards.
a) find the momentum of the electron.
b) find the kinetic energy of the electron.
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Ответ:
The momentum would be as follows:
p = E / c
p= (h(c) / (wavelength)) / c
p = h / wavelength
p = 6.626x10^-34 J s / 0.828x10^-9 m
p = 8.00 x 10^-25 kg m/s
b)Find the kinetic energy of the electron.
Assuming this is a head-on collision, then cosine of the angle would be -1.
wavelength (after) - wavelength (before) = 2(h / m(e) c)
wavelength (after) = 2(h/m(e) c) + wavelength (before)
wavelength (after) = 0.00485 nm + 0.828 nm
wavelength (after) = 0.83385 nm
E = h(c)/wavelength
E(before) = h c / 0.828x10^-9 = 2.4x10^-16 J
E(after) = h c / 0.83385 x10^-9 = 2.38 x10^-16 J
Total change in E = 2.4x10^-16 J - 2.38 x10^-16 J
Total change in E = 3.16x10^-17 J
Ответ:
We're no strangers to love
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A full commitment's what I'm thinking of
You wouldn't get this from any other guy
I just wanna tell you how I'm feeling
Gotta make you understand
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Never gonna run around and desert you
Never gonna make you cry, never gonna say goodbye
Never gonna tell a lie and hurt you
We've known each other for so long
Your heart's been aching but you're too shy to say it
Inside we both know what's been going on
We know the game and we're gonna play it
And if you ask me how I'm feeling
Don't tell me you're too blind to see
Never gonna give you up, never gonna let you down
Never gonna run around and desert you
Never gonna make you cry, never gonna say goodbye
Never gonna tell a lie and hurt you
Never gonna give you up, never gonna let you down
Never gonna run around and desert you
Never gonna make you cry, never gonna say goodbye
Never gonna tell a lie and hurt you
(Ooh, give you up)
(Ooh, give you up)
(Ooh) never gonna give, never gonna give (give you up)
(Ooh) never gonna give, never gonna give (give you up)
We've known each other for so long
Your heart's been aching but you're too shy to say it
Inside we both know what's been going on
We know the game and we're gonna play it
I just wanna tell you how I'm feeling
Gotta make you understand
Never gonna give you up, never gonna let you down
Never gonna run around and desert you
Never gonna make you cry, never gonna say goodbye
Never gonna tell a lie and hurt you
Never gonna give you up, never gonna let you down
Never gonna run around and desert you
Never gonna make you cry, never gonna say goodbye
Never gonna tell a lie and hurt you
Never gonna give you up, never gonna let you down
Never gonna run around and desert you
Never gonna make you cry, never gonna say goodbye
Never gonna tell a lie and hurt you
Explanation: