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#1 Class 12 Physics Atoms 2020 Mcq 1M CBSE
The hydrogen atom can give spectral lines in the Lyman, Balmer and Paschen series. Which of the following statements is correct?
A. Balmer series is in the visible region
B. Paschen series is in the visible region
C. Lyman series is in the infrared region
D. Balmer series is in the ultraviolet region
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#2 Class 12 Physics Atoms 2019 Mcq 1M CBSE
According to Rutherford's atomic model, the electrons inside the atom are
A. stationary
B. not stationary (revolving)
C. centralized
D. none of these
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#3 Class 12 Physics Atoms 2007 Mcq 1M CBSE
Rutherford's $\alpha$-particle experiment showed that atoms have
A. proton
B. nucleus
C. neutron
D. electrons
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#4 Class 12 Physics Atoms 2013 Mcq 1M CBSE
Which series comes in the visible region of the hydrogen spectrum?
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
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#5 Class 12 Physics Atoms 2020 Short 1M CBSE
What is the minimum angular momentum of an electron in the hydrogen atom?
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#6 Class 12 Physics Atoms 2021 Short 2M CBSE
A hydrogen atom makes a transition from $n = 5$ to $n = 1$ orbit and emits a photon of wavelength $\lambda$. What is the wavelength of the photon emitted when it makes a transition from $n = 5$ to $n = 2$ orbit?
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#7 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 2M CBSE
Photons of energy 6 eV are incident on cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 5 eV are incident on C, no photoelectrons will reach anode A. Find...
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#8 Class 12 Physics Dual Nature of Radiation and Matter 2021 Short 2M CBSE
When a photon of energy 5 eV falls on a metallic surface of work function 3 eV, find the kinetic energy of emitted electrons.
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#9 Class 12 Physics Dual Nature of Radiation and Matter 2023 Short 3M CBSE
The ground state energy of hydrogen atom is $-13.6$ eV. The photon emitted during the transition of electron from $n = 3$ to $n = 1$ is incident on a photosensitive material. Photoelectrons are emitted with maximum KE...
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#10 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 3M CBSE
For the photoelectric $I$-$V$ graph: (a) What do X and A on the horizontal axis represent? (b) Draw this graph for three frequencies $\nu_1, \nu_2, \nu_3$ ($\nu_3 > \nu_2 > \nu_1$) for same intensity. (c) Draw t...
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#11 Class 12 Physics Dual Nature of Radiation and Matter 2021 Short 3M CBSE
Radiation of frequency $10^{15}$ Hz is incident on three surfaces A, B and C. Surface A: no photoemission. Surface B: photoemission with zero KE. Surface C: photoemission with some KE. Explain using Einstein's photoel...
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#12 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 3M CBSE
The wavelength $\lambda$ of a photon and the de-Broglie wavelength of an electron of mass $m$ have the same value. Show that the energy of the photon is $\frac{2\lambda mc}{h}$ times the kinetic energy of the electron.
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#13 Class 12 Physics Dual Nature of Radiation and Matter 2023 Long 4M CBSE
Case Study: Photoelectric Effect (I) In a photoelectric experiment, plate current vs anode potential is plotted. Curves A and B have the same stopping potential but different saturation currents. Curves B and C have d...
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#14 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 3M CBSE
A platinum surface having work function 5.63 eV is illuminated by a monochromatic source of frequency $1.6 \times 10^{15}$ Hz. Find the minimum de-Broglie wavelength associated with the ejected electron.
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#15 Class 12 Physics Dual Nature of Radiation and Matter 2023 Long 4M CBSE
A photoelectric cell with a platinum emitter (work function 6.35 eV) is illuminated. (i) If infrared radiation of $3 \times 10^{11}$ Hz is used, determine the reading of the microammeter. Justify mathematically. (ii) ...
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#16 Class 12 Physics Dual Nature of Radiation and Matter 2021 Short 2M CBSE
Plot a graph showing the variation of de-Broglie wavelength $\lambda$ versus $1/\sqrt{V}$, where $V$ is the accelerating potential for a charged particle. What does the slope of this graph give?
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#17 Class 12 Physics Dual Nature of Radiation and Matter 2022 Long 5M CBSE
(i) Describe briefly three experimentally observed features in the phenomenon of photoelectric effect. (ii) Discuss briefly how the wave theory of light cannot explain these features.
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#18 Class 12 Physics Dual Nature of Radiation and Matter 2023 Long 5M CBSE
Write two characteristic features observed in photoelectric effect which support the photon picture of electromagnetic radiation. Draw a graph between frequency $\nu$ of incident radiation and maximum KE of emitted el...
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#19 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 2M CBSE
The graph shows variation of photoelectric current $I$ versus applied voltage $V$ for two photosensitive materials and two different intensities. Identify the pairs of curves that correspond to different materials but...
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#20 Class 12 Physics Dual Nature of Radiation and Matter 2020 Short 1M CBSE
Write the relationship of de-Broglie wavelength $\lambda$ associated with a particle of mass $m$ in terms of its kinetic energy $E$.
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