What is the longest wavelength of light that will emit electrons from a metal whose work function is 2.10
Favorites|Homepage
Subscriptions | sitemap
HOME > Physics > What is the longest wavelength of light that will emit electrons from a metal whose work function is 2.10

What is the longest wavelength of light that will emit electrons from a metal whose work function is 2.10

[From: ] [author: ] [Date: 11-04-24] [Hit: ]
= (3x10^8)/(5.=5.......
What is the longest wavelength of light that will emit electrons from a metal whose work function is 2.10 eV?

-
hf = work function + KE
However if you are looking at the max wavelength (or threshold frequency) then there will only be just enough energy for the photoelectrons to be liberated, hence their KE will be 0.
So hf = work function
convert eV to joules, 2.4 x (1.6 x 10^-19) = 3.84 x 10^-19
therefore, hf = 3.84 x 10^-19
f = 3.84 x 10^-19 / planck's constant which is 6.63 x 10^-34
f = 5.79 x 10^14 Hz
c = frequency x wavelength,
wavelength = speed of light/frequency
= (3x10^8)/(5.79x10^14)
=5.18 x 10^-7 metres
1
keywords: the,2.10,whose,wavelength,What,will,is,function,work,longest,of,emit,metal,light,electrons,that,from,What is the longest wavelength of light that will emit electrons from a metal whose work function is 2.10
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .