The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these two

Bhautik Study Logo

Bhautik Study

Physics | CBSE | JEE | NEET

🧑‍🏫 Author: Aditya Bhatt Sir   |   🕒 Last Updated: July 13, 2025

Table of Contents

📘Question

The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these two metal surface, then photo-electric effect is possible for the case of 

(1) Li only 

(2) Cs only 

(3) Neither Cs nor Li 

(4) Both Cs and Li     (JEE-2025)   

✅ Answer

The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these two metal surface, then photo-electric effect is possible for the case of  (1) Li only  (2) Cs only  (3) Neither Cs nor Li  (4) Both Cs and Li 

🚀 Learn more at BhautikStudy.com

📘 This content is provided by Bhautik Study — for CBSE, JEE, and NEET physics preparation.
Visit: www.bhautikstudy.com