Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surfface is: (Plancks constant . h =6.62 × 10-34 J . s )

Question

Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surfface is: (Plancks constant . h =6.62 × 10-34 J . s ) (A) 2.27 eV (B) 2.59 eV (C) 1.93 eV (D) 2.10 eV

Tardigrade Admin · Accepted Answer

Graph of V s and f given ( B 5.5,0) h v=φ+e Vs at B V s =0, v=5.5 ⇒ h × 5.5 × 1014=φ φ=(6.62 × 10-34 × 5.5 × 1014/1.6 × 10-19) eV =2.27 eV

Q. Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surfface is : (Plancks constant $h = 6.62 \times 1 0^{- 34} J . s)$

$2.27 e V$

$2.59 e V$

$1.93 e V$

$2.10 e V$

Graph of $V_{s}$ and $f$ given $(B 5.5, 0)$
$h v = ϕ + e V_{s}$
at B $V_{s} = 0, v = 5.5$
$\Rightarrow h \times 5.5 \times 1 0^{14} = ϕ$
$ϕ = \frac{6.62 \times 1 0 ^{- 34} \times 5.5 \times 1 0 ^{14}}{1.6 \times 1 0 ^{- 19}} e V$
$= 2.27 e V$

Q. Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surfface is : (Plancks constant h=6.62×10−34J.s)

2.27eV

2.59eV

1.93eV

2.10eV