The maximum force needed to remove an electron form potassium metal is 3.70 × 10-19 J.?

Part 2 of the question: If photons of frequency 13.54 × 1014 s-1 are shone on the surface of the metal, what is the kinetic energy (J) of the ejected electrons ?
Answers:
I devise the given enenergy is the minmum energy or minimum work needed to remove an electron.

The kinetic energy of the incoming photon is equal to the work required to remove an electron plus its kinetic vigour:

E_photon = W + E_kin
<=>
h·f = W + m·v^2/2
(h Planck's constant, f frequency of the photon, m mass of electron, v speed of electron)

Hence:
v = √ [ 2·(h·f - W) / m ]
= √ [ 2 · ((6.626×10^-34Js · 13.54×10^14s^-1) - 3.7×10^19J ) / 9.109×10^-31kg ]
= 1.08×10^6m/s Source(s): http://en.wikipedia.org/wiki/Photoelectr…

Related Questions:
Do you reason metal is a lagitamet art form?   Are in attendance any metals that can form covalent bonds?   Coke is an dirty form of carbon to be precise habitually used contained by industrial preparations of metals from their oxides.?   2. Sodium metal react next to hose vapor within nouns to form solid sodium hydroxide and hydrogen.?   I'm forming a metal leash. how do i find a drummer?  
  • Why do metals other form ionic compounds a bit than covalent compounds?
  • Is possible that metal will form denial ion?
  • What type of elements (metals, metalloids, or nonmetals) form ionic bonds near nonmetals?
  • Write out the formulas for hyrdide compounds formed by Group 1 metal.?
  • Lithium metal react near react near dampen to form aqueous lithium hydroxide, LiOH, an hydrogen gas.?