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12th West Bengal Board
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For the Bohr's second orbit of circumference 2πr, the deBroglie wavelength of revolving electron will be

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

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 ?

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 62

If kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor

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 63
A particle of mass M at rest decays into two masses m1 and m2 with non-zero velocities, The ratio of the de Broglie wavelength of the particles λ1λ2 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 64
The energy of a photon is equal to the kinetic energy of a proton. The energy of the photon is E. Let λ1 be the de- Broglie wavelength of the proton and λ2 be the wavelength of the photon. The ratio λ1λ2 is proportional to 
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 65
An α-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wbm-2 . The de-Broglie wavelength associated with the particle will be
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 66
If the momentum of the electron is changed by P, then the de Broglie wavelength associated with it changes by 0.5%. The initial momentum of the electron will be