What is the binding energy (in J/mol or kJ/mol) of an electron in a metal whose threshold frequency for photoelectrons is 2.50 u 1014 /s?

binding energy is 99771 J/mol

Exlanation:

given data

threshold frequency = 2.50 ×   Hz

solution

we get here binding energy using threshold frequency of the metal that is express as

   ..................1

here E is the energy of electron per atom  and h is plank constant i.e.  and x is  binding energy

and here N is the Avogadro constant =

so E will  

E =  

so put value in equation 1 we get

= 2.50 ×   ×  

solve it we get

x = 99770.99

so  binding energy is 99771 J/mol

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y