JEE PYQ: Atomic Structure Question 17
Question 17 - 2020 (02 Sep Shift 2)
The work function of sodium metal is $4.41 \times 10^{-19}$ J. If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons will be ____ $\times 10^{-21}$ J.
Show Answer
Answer: 222
Solution
$(KE)_{max} = \frac{hc}{\lambda} - W = 6.63 \times 10^{-19} - 4.41 \times 10^{-19} = 2.22 \times 10^{-19}$ J $= 222 \times 10^{-21}$ J.
BETA
