The work function of a metallic surface is 5. | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The energy of the incident photon is given by $E = \frac{hc}{\lambda}$.Using $hc = 12420 \ eV \ \mathring{A}$ (or $12375 \ eV \ \mathring{A}$ as p

Vedclass · Accepted Answer

$1.2$

Vedclass · Answer

(A) The energy of the incident photon is given by $E = \frac{hc}{\lambda}$.Using $hc = 12420 \ eV \ \mathring{A}$ (or $12375 \ eV \ \mathring{A}$ as per the provided constant $h = 4.14 	imes 10^{-15} \ eV \ s$ and $c = 3 	imes 10^8 \ m/s$):$E = \frac{4.14 	imes 10^{-15} 	imes 3 	imes 10^8 	imes 10^{10}}{2000} \ eV = 6.21 \ eV$.Using the photoelectric equation $E = W_0 + K_{max}$,where $K_{max} = eV_0$:$6.21 \ eV = 5.01 \ eV + eV_0$.$eV_0 = 6.21 \ eV - 5.01 \ eV = 1.20 \ eV$.Therefore,the stopping potential $V_0 = 1.2 \ V$.

Column-$I$	Column-$II$
$a$. Superior Vena Cava	$p$. Carries deoxygenated blood to the lungs
$b$. Inferior Vena Cava	$q$. Carries oxygenated blood to the heart
$c$. Pulmonary Artery	$r$. Brings deoxygenated blood from lower body parts to the right atrium
$d$. Pulmonary Vein	$s$. Brings deoxygenated blood from upper body parts to the right atrium

The work function of a metallic surface is $5.01 \ eV$. The photo-electrons are emitted when light of wavelength $2000 \ \mathring{A}$ falls on it. The potential difference applied to stop the fastest photo-electrons is ............. $volts$ $[h = 4.14 \times 10^{-15} \ eV \ s]$

Similar Questions

$\left(\frac{1+i}{1-i}\right)^4+\left(\frac{1-i}{1+i}\right)^4$ is equal to

If a wire of length $L$ forms a loop of radius $R$ and has $n$ turns,find the magnetic field at the centre of the loop if the current flowing in the loop is $I$.

Which of the following wiring diagrams could be used to experimentally determine $R$ using Ohm's law? Assume an ideal voltmeter and an ideal ammeter.

The part of the castor seed from which oil is obtained is called the .....

Vedclass Test Series

Exam Paper Generator

Online Exam Module