Verified Solution • 2025–26 Session moderate

QJEEM20Ch60ee: JEE Main 2020 Chemistry - Class 11 JEEM20Ch60ee Solution: The work function of sodium metal is 4.41 10 –19 J. If photons…

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 (h = 6.63 ×\times 10–34 J s; c = 3 ×\times 108 m/s) ________ × 10–21 J.

Step-by-Step Verified Solution

E = W + KEmax

⇒\Rightarrow KEmax = E - W

= hcλ{{hc} \over \lambda } - 4.41 ×\times 10–19

= 6.63×10−34×3×108300×10−9{{6.63 \times {{10}^{ - 34}} \times 3 \times {{10}^8}} \over {300 \times {{10}^{ - 9}}}} - 4.41 ×\times 10–19

= 2.22 × 10–19 J

= 222 × 10–21 J

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