The maximum velocity of an electron emitted by light of wavelength $\lambda$ incident on the surface of a metal of work function $\phi$ is [Where $h =$ Planck's constant,$m =$ mass of electron,and $c =$ speed of light].
- A$[\frac{2(hc + \lambda \phi)}{m \lambda}]^{1/2}$
- B$\frac{2(hc + \lambda \phi)}{m}$
- C$[\frac{2(hc - \lambda \phi)}{m \lambda}]^{1/2}$
- D$[\frac{2(h \lambda - \phi)}{m}]^{1/2}$
Explore More
Similar Questions
The cyclotron frequency of an electron gyrating in a magnetic field of $1\, T$ is approximately
Match the appropriate pairs from List-$I$ and List-$II$ :
List-$I$ List-$II$ $1$. Nitrogen molecules $(A)$ Continuous spectrum $2$. Incandescent solids $(B)$ Absorption spectrum $3$. Fraunhoffer lines $(C)$ Band spectrum $4$. Electric arc between iron rods $(D)$ Emission spectrum
| List-$I$ | List-$II$ |
|---|---|
| $1$. Nitrogen molecules | $(A)$ Continuous spectrum |
| $2$. Incandescent solids | $(B)$ Absorption spectrum |
| $3$. Fraunhoffer lines | $(C)$ Band spectrum |
| $4$. Electric arc between iron rods | $(D)$ Emission spectrum |
Which equilibrium can be described as an acid-base reaction using the Lewis acid-base definition but not using the Bronsted-Lowry definition?
An inductor of $2\,H$ and a resistance of $10\,\Omega$ are connected in series with a battery of $5\,V$. The initial rate of change of current is.....$A/s$.
If $\alpha$ and $\beta$ are imaginary cube roots of unity,then the value of $\alpha^4 + \beta^{28} + \frac{1}{\alpha\beta}$ is:
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo