1. Tardigrade
  2. Question
  3. Chemistry
  4. The work function (φ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is Metal Li Na K Mg Cu Ag Fe Pt W φ(eV) 2.4 2.3 2.2 3.7 4.8 4.3 4.7 6.3 4.75

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The work function $\left(\phi\right)$ of some metals is listed below. The number of metals which will show photoelectric effect when light of $300 nm$ wavelength falls on the metal is
Metal Li Na K Mg Cu Ag Fe Pt W
$\phi\left(eV\right)$ 2.4 2.3 2.2 3.7 4.8 4.3 4.7 6.3 4.75

Structure of Atom

Solution:

Since the value of $hc = 1240 \,eV \,nm$
Energy corresponding to $\lambda=300\, nm$ is
$\frac{1240\,eV\,nm}{300\,nm}=4.134\,eV$
Elements having $\phi < 4.134 \,eV $ will show photoelectric effect,
are $Li, Na, K$, and $Mg \Rightarrow $ image
So, number of metals showing photo electric effect will be four,
i.e., $Li, Na, K$, and $Mg$.