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12th West Bengal Board
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 In the Bohr model of the hydrogen atom 

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Important Questions on Bohr Model, X-Ray Spectra, Wave-Particle Duality

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 20 - Bohr Model, X-Ray Spectra, Wave-Particle Duality>EXERCISE 20>Q 54
The ratio of their de-Broglie wavelength λeλp is when an electron of mass me and a proton of mass mp are moving with the same speed.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 20 - Bohr Model, X-Ray Spectra, Wave-Particle Duality>EXERCISE 20>Q 55
The ratio of the de-Broglie wavelength associated with these particles, when an electron and a proton are moving in the same direction with same kinetic energy.
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 20 - Bohr Model, X-Ray Spectra, Wave-Particle Duality>EXERCISE 20>Q 56
An α -particle and a proton are accelerated from rest by a potential difference of 100 V.  After this their de-Broglie wavelength are λα and λp respectively. The ratio λpλe, to the nearest integer is 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 20 - Bohr Model, X-Ray Spectra, Wave-Particle Duality>EXERCISE 20>Q 57
The de-Broglie wavelength of the electron in the ground state of the hydrogen atom is (Radius of the first orbit of hydrogen atom  =0.53A→)
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 20 - Bohr Model, X-Ray Spectra, Wave-Particle Duality>EXERCISE 20>Q 58
For the Bohr's second orbit of circumference 2πr, the deBroglie wavelength of revolving electron will be
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 20 - Bohr Model, X-Ray Spectra, Wave-Particle Duality>EXERCISE 20>Q 59
If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 20 - Bohr Model, X-Ray Spectra, Wave-Particle Duality>EXERCISE 20>Q 60
Electron with de-Broglie wavelength λ fall on the target in an X -ray tube. The cut-off wavelength of emitted X-rays is
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 20 - Bohr Model, X-Ray Spectra, Wave-Particle Duality>EXERCISE 20>Q 61

If alpha, beta and gamma rays carry same momentum which has the longest wavelength ?