enEnglishhiहिन्दी
NEET · Physics · STD 12 - 11. Dual nature of radiation and matter
When two monochromatic lights of frequency, \(v\) and \(\frac{v}{2}\) are incident on a photoelectric metal, their stopping potential becomes \(\frac{V_{S}}{2}\) and \(V_{s}\) respectively. The threshold frequency for this metal is :
- A \(3\,v\)
- B \(\frac{2}{3}\,v\)
- C \(\frac{3}{2}\,v\)
- D \(2\,v\)
Answer & Solution
Correct Answer
(C) \(\frac{3}{2}\,v\)
Step-by-step Solution
Detailed explanation
Using the equation \(eV = hu -\phi\)
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
- A body of mass \(1\, kg\) begins to move under the action of a time dependent force \(\overrightarrow {\;F\;} = (2t\hat i + 3{t^2}\hat j\)) \(N\) where \(\hat i\) and \(\hat j\) are unit vectors along \(x\) and \(y\) axis. What 10.Power will be developed by the force at the time \(t\)?NEET 2016 Hard
- Polar molecules are the molecules:NEET 2021 Easy
- Two blocks \(A\) and \(B\) of masses \(3\,m\) and \(m\) respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of \(A\) and \(B\) immediately after the string is cut, are respectively
NEET 2017 Medium - In a vernier callipers, \((N+1)\) divisions of vernier scale coincide with \(N\) divisions of main scale. If \(1 \mathrm{MSD}\) represents \(0.1 \mathrm{~mm}\), the vernier constant (in \(\mathrm{cm}\) ) is:NEET 2024 Medium
- The magnetic energy stored in an inductor of inductance \(4\,\mu H\) carrying a current of \(2\,A\) is :NEET 2023 Easy
- Find the torque about the orlgin when a force of \(3 \hat{j}\, N\) acts on a particle whose position vector is \(2 \hat{k}\, m \)NEET 2020 Easy
More PYQs from NEET
- A particle of mass \(10\, g\) moves along a circle of radius \(6.4\, cm\) with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to \(8 \times 10^{-4}\,J\) by the end of the second revolution after the beginning of the motion \(?\) .............. \(\mathrm{m} / \mathrm{s}^{2}\)NEET 2016 Medium
- Two conducting circular loops of radii \(R_{1}\) and \(\mathrm{R}_{2}\) are placed in the same plane with their centres coinciding. If \(R_{1}>>R_{2}\), the mutual inductance \(M\) between them will be directly proportional to:NEET 2021 Medium
- In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction.......\(^o\) ?NEET 2019 Easy
- The \(K_{sp}\) of \(Ag_2CrO_4, AgCl, AgBr\) and \(AgI\) are respectively, \(1.1 \times 10^{-12}, 1.8 \times 10^{-10},\)\( 5.0 \times 10^{-13}, 8.3 \times 10^{-17}.\) Which one of the following salts will precipitate last if \(AgNO_3\) solution is added to the solution containing equal moles of \(NaCl, NaBr, NaI\) and \(Na_2CrO_4\) ?NEET 2015 Hard
- Given below are two statements: one is labelled as Assertion \(A\) and the other is labelled as Reason \(R\). Assertion \(A\): Nephrons are of two types: Cortical and Juxta medullary, based on their relative position in cortex and medulla. Reason \(R\): Juxta medullary nephrons have short loop of Henle whereas, cortical nephrons have longer loop of Henle. In the light of the above statements, choose the correct answer from the options given below:NEET 2023 Medium
- A tightly wound \(100\) turns coil of radius \(10 \mathrm{~cm}\) carries a current of \(7 \mathrm{~A}\). The magnitude of the magnetic field at the centre of the coil is (Take permeability of free space as \(4 \pi \times 10^{-7} \mathrm{SI}\) units):NEET 2024 Medium