The work functions for tungsten and sodium ar | vedclass

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

Question

(C) The work function $\phi_0$ is related to the threshold wavelength $\lambda_0$ by the formula: $\phi_0 = \frac{hc}{\lambda_0}$.Since $h$ and $c$ ar

Vedclass · Accepted Answer

$2791$

Vedclass · Answer

(C) The work function $\phi_0$ is related to the threshold wavelength $\lambda_0$ by the formula: $\phi_0 = \frac{hc}{\lambda_0}$.Since $h$ and $c$ are constants,we have $\lambda_0 \propto \frac{1}{\phi_0}$.Therefore,$\frac{(\lambda_0)_{	ext{tungsten}}}{(\lambda_0)_{	ext{sodium}}} = \frac{(\phi_0)_{	ext{sodium}}}{(\phi_0)_{	ext{tungsten}}}$.Substituting the given values: $\frac{(\lambda_0)_{	ext{tungsten}}}{5460 \ \mathring{A}} = \frac{2.3 \ eV}{4.5 \ eV}$.$(\lambda_0)_{	ext{tungsten}} = 5460 	imes \frac{2.3}{4.5} \ \mathring{A}$.$(\lambda_0)_{	ext{tungsten}} \approx 2790.6 \ \mathring{A} \approx 2791 \ \mathring{A}$.

The work functions for tungsten and sodium are $4.5 \ eV$ and $2.3 \ eV$ respectively. If the threshold wavelength for sodium is $5460 \ \mathring{A}$,then the threshold wavelength for tungsten is .......... $\mathring{A}$.

Similar Questions

If $f(0)=0, f(1)=1, f(2)=2$ and $f(x)=f(x-2)+f(x-3)$ for $x=3, 4, 5, \ldots$, then $f(9)$ is equal to

The endosperm of gymnosperms is $...$

If $f(x) = \frac{1}{1+\frac{1}{x}}$ and $g(x) = \frac{1}{1+\frac{1}{f(x)}}$,then $g^{\prime}(2)$ is equal to

In gene therapy of adenosine deaminase $\text{(ADA)}$ deficiency,the patient requires periodic infusion of genetically engineered lymphocytes because:

Which of the following haloalkanes will undergo $S_{N}2$ reaction at the fastest rate?

Vedclass Test Series

Exam Paper Generator

Online Exam Module