JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter
The threshold wavelength for photoelectric emission from a material is \(5500\,\mathring A\). Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a \(A.\) \(75\,W\) infra-red lamp \(B.\) \(10\,W\) infra-red lamp \(C.\) \(75\,W\) ultra-violet lamp \(D.\) \(10\,W\) ultra-violet lamp Choose the correct answer from the options given below :
- A \(B\) and \(C\) only
- B \(A\) and \(D\) only
- C \(C\) only
- D \(C\) and \(D\) only
Answer & Solution
Correct Answer
(D) \(C\) and \(D\) only
Step-by-step Solution
Detailed explanation
\(\lambda < 5500\, \mathring A\) for photoelectric emission. \(\lambda_{ uv } < 5500\, \mathring A\)
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 water drop of diameter \(cm\) is broken into \(64\) equal droplets. The surface tension of water is \(0.075\,N / m\). In this process the gain in surface energy will be ...........\(J\)JEE Mains 2022 Hard
- A convex lens (of focal length \(20\, cm\)) and a concave mirror, having their principal axes along the same lines, are kept \(80\, cm\) apart from each other. The concave mirror is to the right of the convex lens. When an object is kept at a distance of \(30\, cm\) to the left of the convex lens, its image remains at the same position even if the concave mirror is removed. The maximum distance of the object for which this concave mirror, by itself would produce a virtual image would be.....\(cm\)JEE Mains 2019 Hard
- Starting from the origin at time \(t=0,\) with initial velocity \(5 \hat{ j }\, ms ^{-1},\) a particle moves in the \(x-y\) plane with a constant acceleration of \((10 \hat{ i }+4 \hat{ j })\, ms ^{-2}\). At time \(t\), its coordinates are \(\left(20\, m , y _{0}\, m \right) .\) The values of \(t\) and \(y _{0},\) are respectivelyJEE Mains 2020 Medium
- The ratio of the coefficient of volume expansion of a glass container to that of a viscous liquid kept inside the container is \(1 : 4\). What fraction of the inner volume of the container should the liquid occupy so that the volume of the remaining vacant space will be same at all temperatures ?JEE Mains 2013 Medium
- In a Young’s double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is \(1/8^{th}\) of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close toJEE Mains 2019 Medium
- If \(K_{1}\) and \(K_{2}\) are the thermal conductivities \(L_{1}\) and \(L _{2}\) are the lengths and \(A _{1}\) and \(A _{2}\) are the cross sectional areas of steel and copper rods respectively such that \(\frac{K_{2}}{K_{1}}=9, \frac{A_{1}}{A_{2}}=2, \frac{L_{1}}{L_{2}}=2\). Then, for the arrangement as shown in the figure. The value of temperature \(T\) of the steel - copper junction in the steady state will be ........... \(^{\circ} C\)
JEE Mains 2022 Medium
More PYQs from JEE Mains
- The distance of the point \((1,1,9)\) from the point of intersection of the line \(\frac{x-3}{1}=\frac{y-4}{2}=\frac{z-5}{2}\) and the plane \(x+y+z=17\) isJEE Mains 2021 Medium
- Five charges \(+q,+5 q,-2 q,+3 q\) and \(-4 q\) are situated as shown in the figure. The electric flux due to this configuration through the surface \(S\) is _______.
JEE Mains 2024 Hard - The linear mass density of a thin rod \(A B\) of length \(L\) varies from \(A\) to \(B\) as \(\lambda( x )=\lambda_{0}\left(1+\frac{ x }{ L }\right),\) where \(x\) is the distance from A. If \(M\) is the mass of the rod then its moment of inertia about an axis passing through \(A\) and perpendicular to the rod is\(......ML^{2}\)JEE Mains 2020 Hard
- A ray of light is incident from a denser to a rarer medium. The critical angle for total internal reflection is \({\theta _{iC}}\) and Brewster's angle of incidence is \({\theta _{iB}}\), such that \(\sin \,{\theta _{iC}}/\sin \,{\theta _{iB}} = \eta = 1.28\). The relative refractive index of the two media isJEE Mains 2014 Medium
- Let A and B be the two points of intersection of the line \(y+5=0\) and the mirror image of the parabola \(y^2=4 x\) with respect to the line \(x+y+4=0\). If d denotes the distance between A and B , and a denotes the area of \(\triangle S A B\), where \(S\) is the focus of the parabola \(y^2=4 x\), then the value of \((a+d)\) is \(\qquad\) -JEE Mains 2025 Hard
- An angle of intersection of the curves, \(\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1\) and \(\mathrm{x}^{2}+\mathrm{y}^{2}=\mathrm{ab}, \mathrm{a}>\mathrm{b}\), is :JEE Mains 2021 Hard