JEE Mains · Physics · STD 12 - 12. atoms
In hydrogen atom spectrum, (R is Rydberg's constant):
A. the maximum wavelength of the radiation of Lyman series is \(\frac{4}{3 R}\)
B. the Balmer series lies in the visible region of the spectrum
C. the minimum wavelength of the radiation of Paschen series is \(\frac{9}{R}\)
D. the minimum wavelength of Lyman series is \(\frac{5}{4 R}\)
Choose the correct answer from the options given below :
- A B, D Only
- B A, B and C Only
- C A, B and D Only
- D A, B Only
Answer & Solution
Correct Answer
(B) A, B and C Only
Step-by-step Solution
Detailed explanation
\( \frac{1}{\lambda}=R(1-\frac{1}{4})\) \(\lambda=\frac{4}{3R} \) \( \frac{1}{\lambda'}=R(\frac{1}{9})\) \( \lambda'=\frac{9}{R} \)
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 man in a car at location \(Q\) on a straight highway is moving with speed \(v\). He decides to reach a point \(P\) in a field at a distance \(d\) from highway (point \(M\) ) as shown in the figure.Speed of the car in the field is half to that on the highway. What should be the distance \(RM\), so that the time taken to reach \(P\) is minimum?
JEE Mains 2018 Hard - The center of mass of a thin rectangular plate (fig - x ) with sides of length \(a\) and \(b\), whose mass per unit area \((\sigma)\) varies as \(\sigma=\frac{\sigma_0 x}{a b}\) (where \(\sigma_0\) is a constant), would be \(\qquad\)
JEE Mains 2025 Medium - For a free body diagram shown in the figure, the four forces are applied in the ' \(x\) ' and ' \(y\) ' directions. What additional force must be applied and at what angle with positive \(x\)-axis so that the net acceleration of body is zero?
JEE Mains 2022 Medium - A part of a complete circuit is shown in the figure. At some instant, the value of current \(I\) is \(1\, A\) and it is decreasing at a rate of \(10^{2}\, A s ^{-1}\) The value of the potential difference \(V _{ P }- V _{ Q }\) (in volts) at that instant, is.
JEE Mains 2020 Medium - Radiation \(p\) with wavelength \(6561\;\mathring A\) falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of \(3 \times 10^{-4}\; T\). If the radius of the largest circular path followed by the electrons is \(10 \;\mathrm{mm},\) the work function of the metal is close to ............... \(eV\)JEE Mains 2020 Hard
- A fighter plane of length \(20\, m\), wing span (distance from tip of one wing to the tip of the other wing) of \(15\,m\) and height \(5\,m\) is lying towards east over Delhi. Its speed is \(240\, ms^{-1}\) . The earth's magnetic field over Delhi is \(5 \times 10^{-5}\,T\) with the declination angle \( \sim {0^o}\) and dip of \(\theta\) such that \(\sin \,\theta = \frac{2}{3}\). If the voltage developed is \(V_B\) between the lower and upper side of the plane and \(V_W\) between the tips of the wings then \(V_B\) and \(V_W\) are close toJEE Mains 2016 Hard
More PYQs from JEE Mains
- If \(\frac{\sin ^{-1} x}{a}=\frac{\cos ^{-1} x}{b}=\frac{\tan ^{-1} y}{c} ; 0< x< 1,\) then the value of \(\cos \left(\frac{\pi c }{ a + b }\right)\) isJEE Mains 2021 Hard
- Given below are two statements :- Statement \(I\) : Davisson-Germer experiment establishes the wave nature of electrons. Statement \(II\) : If electrons have wave nature, they can interfere and show diffraction. In the light of the above statements choose the correct answer from the options given belowJEE Mains 2022 Medium
- Let \(C_1\) and \(C_2\) be the centres of the circles \(x^2 + y^2 -2x -2y -2 = 0\) and \(x^2 + y^2 - 6x-6y + 14 = 0\) respectively. If \(P\) and \(Q\) are the points of intersection of these circles, then the area (in sq. units) of the quadrilateral \(PC_1QC_2\) is ............. \(\mathrm{sq. \, units}\)JEE Mains 2019 Hard
- If the four letter words (need not be meaningful) are to be formed using the letters from the word \("MEDITERRANEAN"\) such that the first letter is \(R\) and the fourth letter is \(E,\) then the total number of all such words isJEE Mains 2016 Hard
- If the integral \(525 \int_0^{\frac{\pi}{2}} \sin 2 x \cos ^{\frac{11}{2}} x\left(1+\cos ^{\frac{5}{2}} x\right)^{\frac{1}{2}} d x\) is equal to \((n \sqrt{2}-64)\), then \(n\) is equal toJEE Mains 2024 Hard
- A standing wave is formed by the superposition of two waves travelling in opposite directions. The transverse displacement is given by \(y\left( {x,t} \right) = 0.5\sin\, \left( {\frac{{5\pi }}{4}x} \right)\,\cos\, \left( {200\,\pi t} \right)\). What is the speed of the travelling wave moving in the positive \(x\) direction .... \(m/s\) ? (\(x\) and \(t\) are in meter and second, respectively.)JEE Mains 2017 Hard