Question

Work-function is least for

• A. caesium
• B. aluminium
• C. silver
• D. platinum

Answer 1

Answer: (A)

The work function of platinum is the highest $\left({\varphi }_0=5.65eV\right)$ while it is the lowest $\left({\varphi }_0=2.14eV\right)$ for caesium.