Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: Chikis on 21/07/2014 01:46:13

Title: Calculate the threshold wavelength of the metal.
Post by: Chikis on 21/07/2014 01:46:13

Caesium metal of work function is illuminated with radiations of wavelength . Calculate the:
(i)threshold wavelength of the metal;
(ii)maxium energy of liberated elecrons.


Since threshold frequency and threshold wavelenght are not the same, am confused of the formula to use.
What is the best formula to use? Should I use or should use

Title: Re: Calculate the threshold wavelength of the metal.
Post by: evan_au on 21/07/2014 10:20:49

Would it make more sense if you used the definition that Frequency f = c/λ = (Speed of light)/wavelength.

Perhaps those equations are equivalent?