When light of wavelength 240 nm falls on a cobalt surface, electrons having a maximum kinetic energy of 0.17 ev are emitted. find values for the following. (a) the work function of cobalt ev (b) the cutoff wavelength nm (c) the frequency corresponding to the cutoff wavelength hz

(a) 5.04 eV (B) 248.14 nm (c)

Explanation:

We have given Wavelength of the light  \lambda = 240 nm

According to plank's rule ,energy of light

Maximum KE of emitted electron i= 0.17 eV

Part( A) Using Einstien's equation

, here is work function.

= 5.21 eV-0.17 eV = 5.04 eV

Part( B) We have to find cutoff wavelength

Part (C) In this part we have to find the cutoff frequency

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!