The incorrect statement regarding the characteristics of X-rays is : 1. The radiation can ionize the gas 2. It causes a fluorescence effect on ZnS 3. It is deflected by electric and magnetic fields 4. Have a shorter wavelength than ultraviolet rays

Subtopic:  Introduction of Atomic Structure |
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For any H like system, the ratio of velocities of I, II & III orbit i.e.,  will be

1.  1 : 2 : 3

2.  1 : 1/2 : 1/3

3.  3 : 2 : 1

4.  1 : 1 : 1

Subtopic:  Bohr's Theory |
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In photoelectric effect, the kinetic energy of photoelectrons increases linearly with the

1.  Wavelength of incident light

2.  Frequency of incident light

3.  Velocity of incident light

4.  Atomic mass of an element

Subtopic:  Photo Electric Effect |
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The photoelectric emission from a surface starts only when the light incident upon the surface has a certain minimum:

1.  Intensity

2.  Wavelength

3.  Frequency

4.  Velocity

Subtopic:  Photo Electric Effect |
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The ratio of slopes of  curves in photoelectric effect gives -

(v=frequency, ${\mathrm{K}}_{\mathrm{max}}$=maximum kinetic energy, ${\mathrm{V}}_{0}$ stopping potential):

1.  Charge of electron

2.  Planck's constant

3.  Work function

4.  The ratio of Planck's constant of electronic charge

Subtopic:  Photo Electric Effect |
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The largest de Broglie wavelength among the following (all have equal velocity) is

1.  ${\mathrm{CO}}_{2}$ molecule

2.  ${\mathrm{NH}}_{3}$ molecule

3.  Electron

4.  Proton

Subtopic:  De Broglie Equation |
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The graphs that represents the variation of momentum of particle with de-Broglie wavelength is

1.

2.

3.

4.

Subtopic:  De Broglie Equation |
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The excited state of an H atom emits a photon of wavelength $\mathrm{\lambda }$ and returns to the ground state. The principal quantum number of the excited state is given by:

1.  $\sqrt{\mathrm{\lambda R}\left(\mathrm{\lambda R}-1\right)}$

2.  $\sqrt{\frac{\mathrm{\lambda R}}{\left(\mathrm{\lambda R}-1\right)}}$

3.  $\sqrt{\mathrm{\lambda R}\left(\mathrm{\lambda R}+1\right)}$

4.  $\sqrt{\frac{\left(\mathrm{\lambda R}-1\right)}{\mathrm{\lambda R}}}$

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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A dye absorbs a photon of wavelength $\mathrm{\lambda }$ and re-emits the same energy into two photons of wavelengths  and ${\mathrm{\lambda }}_{2}$ respectively. The wavelength $\mathrm{\lambda }$ is related to ${\mathrm{\lambda }}_{1}$ and ${\mathrm{\lambda }}_{2}$ as-

1.  $\mathrm{\lambda }=\frac{{\mathrm{\lambda }}_{1}+{\mathrm{\lambda }}_{2}}{{\mathrm{\lambda }}_{1}{\mathrm{\lambda }}_{2}}$

2.  $\mathrm{\lambda }=\frac{{\mathrm{\lambda }}_{1}{\mathrm{\lambda }}_{2}}{{\mathrm{\lambda }}_{1}+{\mathrm{\lambda }}_{2}}$

3.  $\mathrm{\lambda }=\frac{{\mathrm{\lambda }}_{1}^{2}+{\mathrm{\lambda }}_{2}^{2}}{{\mathrm{\lambda }}_{1}+{\mathrm{\lambda }}_{2}}$

4.  $\mathrm{\lambda }=\frac{{\mathrm{\lambda }}_{1}{\mathrm{\lambda }}_{2}}{{\left({\mathrm{\lambda }}_{1}+{\mathrm{\lambda }}_{2}\right)}^{2}}$

Subtopic:  Bohr's Theory |
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The quantum number not obtained from the Schrodinger’s wave equation is

1. n

2. $\mathcal{l}$

3. m

4. s

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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