enEnglishhiहिन्दी
JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter
The maximum velocity of the photoelectrons emitted from the surface is \(v\) when light of frequency \(n\) falls on a metal surface. If the incident frequency is increased to \(3n\) , the maximum velocity of the ejected photoelectrons will be
- A less than \(\sqrt 3 v\,\)
- B \(v\)
- C more thanequal \(\sqrt 3 v\,\)
- D equal to \(\sqrt 3 v\,\)
Answer & Solution
Correct Answer
(C) more thanequal \(\sqrt 3 v\,\)
Step-by-step Solution
Detailed explanation
As the metal surface is same, work function \((\phi)\) is same for both the case. Initially \(\mathrm{KE}_{\max }=\mathrm{nh}-\phi\) ..... \((i)\) After increase \(\mathrm{KE}_{\mathrm{max}}^{\prime}=3 \mathrm{nh}-\phi\) ..... \((ii)\) For work function \(\phi-\) not to be…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- An object ' \(o\) ' is placed at a distance of \(100\,cm\) in front of a concave mirror of radius of curvature \(200\,cm\) as shown in the figure. The object starts moving towards the mirror at a speed \(2\,cm / s\). The position of the image from the mirror after \(10\,s\) will be at ...... \(cm\).
JEE Mains 2022 Hard - \(T\) is the time period of simple pendulum on the earth's surface. Its time period becomes \(x T\) when taken to a height \(R\) (equal to earth's radius) above the earth's surface. Then, the value of \(x\) will be:JEE Mains 2023 Medium
- The width of one of the two slits in a Young's double slit experiment is \(4\) times that of the other slit. The ratio of the maximum of the minimum intensity in the interference pattern is _______.JEE Mains 2024 Hard
- If \(R , X _{ L }\). and \(X _{ C }\) represent resistance, inductive reactance and capacitive reactance. Then which of the following is dimensionless:JEE Mains 2023 Easy
- In a hydrogen atom the electron makes a transition from \(( n +1)^{\text {th }}\) level to the \(n ^{\text {th }}\) level. If \(n>>1,\) the frequency of radiation emitted is proportional toJEE Mains 2020 Hard
- When a certain photosensitive surface is illuminated with monochromatic light of frequency \(v\) , the stopping potential for the photo current is \(-V_0/2.\) When the surface is illuminated by monochromatic light of frequency \(v/2,\) the stopping potential is \(-V_0.\) The threshold frequency for photoelectric emission isJEE Mains 2019 Medium
More PYQs from JEE Mains
- The value of \(\tan \left(2 \tan ^{-1}\left(\frac{3}{5}\right)+\sin ^{-1}\left(\frac{5}{13}\right)\right)\) is equal to:JEE Mains 2021 Medium
- Match the \(\frac{C _{ P }}{ C _{ v }}\) ratio for ideal gases with different type of molecules
Moleculae type \(\frac{C _{ P }}{ C _{ v }}\) \((A)\) Monoatomic \((I)\) \(\frac{7}{ 5}\) \((B)\) Diatomic rigid molecules \((II)\) \(\frac{9}{7}\) \((C)\) Diatomic non-rigid molecules \((III)\) \(\frac{4}{3}\) \((D)\) Triatomic rigid molecules \((IV)\) \(\frac{5}{3}\) JEE Mains 2020 Medium - The number of distinct real values of \(\lambda \) on for which the lines \(\frac{{x - 1}}{1} = \frac{{y - 2}}{2} = \frac{{z + 3}}{{{\lambda ^2}}}\) and \(\frac{{x - 3}}{1} = \frac{{y - 2}}{{{\lambda ^2}}} = \frac{{z - 1}}{2}\) are coplanar isJEE Mains 2016 Medium
- If the coefficents of \({x^3}\) and \({x^4}\) in the expansion of \(\left( {1 + ax + b{x^2}} \right){\left( {1 - 2x} \right)^{18}}\) in powers of \(x\) are both zero, then \( (a,b) \) is equal toJEE Mains 2014 Hard
- With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength \(5890\) \(\stackrel{\circ}{{A}}\) is observed at \(5896\) \(\stackrel{\circ}{{A}}\) ? (in \({km} / {sec}\))JEE Mains 2021 Medium
- Let \(\begin{aligned} S _{ n }( x )=\log _{ a ^{1 / 2}} x +\log _{ a / 3} x +\log _{ a ^{1 / 6}} x \\+\log _{ a ^{1 / 11}} x +\log _{ a ^{1 / 18}} x +\log _{ a ^{1 / 27}} x +\ldots . \end{aligned}\) up to \(n-\)terms, where \(a > 1\). If \(S_{24}(x)=1093\) and \(S _{12}(2 x )=265,\) then value of \(a\) is equal to ..... .JEE Mains 2021 Hard