Question

If $\lambda _ { 2 }$respectively incident on a metallic surface. If

• A. $\mathrm { K } _ { 1 } > \left( \mathrm { K } _ { 2 } / 3 \right)$
• B.
• C. $\mathrm { K } _ { 1 } = 3 \mathrm {~K} _ { 2 }$
• D. $\mathrm { K } _ { 2 } = 3 \mathrm {~K} _ { 1 }$

Answer 1

Answer: (B)

Answer 2

: According to Einstein’s photoelectric equation

$\frac { h c } { \lambda } = \phi _ { 0 } + K E _ { \max }$

Where $\phi _ { 0 }$is work function of a metal

Or

Or $K _ { 1 } = K _ { 2 } - \frac { 2 } { 3 } K _ { 2 } - \frac { 2 } { 3 } \phi _ { 0 } = \frac { K _ { 2 } } { 3 } - \frac { 2 } { 3 } \phi _ { 0 }$ or $K _ { 1 } < \frac { K _ { 2 } } { 3 }$