Download App

STD 12 - 11. Dual nature of radiation and matter — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 11. Dual nature of radiation and matter4 Marks
MCQ
The electric field at the point associated with a light wave is given by

$E=200\left[\sin \left(6 \times 10^{15}\right) t+\sin \left(9 \times 10^{15}\right) t\right] \,Vm ^{-1}$

Given : $h=4.14 \times 10^{-15} \,eVs$

If this light falls on a metal surface having a work function of $2.50 \,eV$, the maximum kinetic energy of the photoelectrons will be ........... $eV$

  • A
    $1.90$
  • B
    $3.27$
  • C
    $3.60$
  • ✓
    $3.42$
✓

Answer

Correct option: D.
$3.42$
d
For maximum $KE$ we will take higher frequency $\left(f=\frac{9 \times 10^{15}}{2 \pi} Hz \right)$

$K_{\max }=h f-\phi$

$=\frac{9 \times 10^{15} \times 4.14 \times 10^{-15}}{2 \pi}-2.50$

$3.43 \,eV$

nearest is $3.42 \,eV$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A transverse wave is described by the equation $Y = {Y_0}\sin 2\pi \left( {ft - \frac{x}{\lambda }} \right)$. The maximum particle velocity is four times the wave velocity if
→
If the speed of light in vacuum is $C$ $m/\sec ,$ then the velocity of light in a medium of refractive index $1.5$
→
The bottom of a container filled with liquid appear slightly raised because of
→
Two parallel beams of protons and electrons, carrying equal currents are fixed at a separation $d$. The protons and electrons move in opposite directions. $P$ is a point on a line joining the beams, at a distance $x$ from any one beam. The magnetic field at $P$ is $B$. If $B$ is plotted against $x$, which of the following best represents the resulting curve
→
A cyclist riding the bicycle at a speed of $14 \sqrt{3} \,m / s$ takes a turn around a circular road of radius $20 \sqrt{3} \,m$ without skidding. What is his inclination to the vertical?
→
Two marks on a glass rod $10\, cm$ apart are found to increase their distance by $0.08\, mm$ when the rod is heated from $0\,^oC$ to $100\,^oC$. A flask made of the same glass as that of rod measures a volume $1000\, cc$ at $0\,^oC$. The volume it measures at $100\,^oC$ in $cc$ is
→
Scent sprayer is based on
→
The temperature at which thermal electric power of a thermo couple becomes zero is called
→
A person blows into open-end of a long pipe. As a result, a high-pressure pulse of air travels down the pipe. When this pulse reaches the other end of the pipe then which of the following statements are true ?

$(I)$ a high-pressure pulse starts travelling up the pipe, if the other end of the pipe is open

$(II)$ a low -pressure pulse starts travelling up the pipe, if the other end of the pipe is open

$(III)$ a low pressure pulse starts travelling up the pipe, if the other end of the pipe is closed

$(IV)$ a high-pressure pulse starts travelling up the pipe, if the other end of the pipe is closed

→
If the nucleus ${}_{13}^{27}Al$ has a nuclear radius of  about $3.6\,\, fm,$ then ${ }_{32}^{125} Te$ would have its radius  approximately as .......$fm$
→