WBJEE PYQs for De Broglie Hypothesis with Solutions: Practice WBJEE Previous Year Questions

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Yashodeep Mahurkar

Updated on - Dec 31, 2025

De Broglie Hypothesis is an important topic in the Physics section in WBJEE exam. Practising this topic will increase your score overall and make your conceptual grip on WBJEE exam stronger.

This article gives you a full set of WBJEE PYQs for De Broglie Hypothesis with explanations for effective preparation. Practice of WBJEE Physics PYQs including De Broglie Hypothesis questions regularly will improve accuracy, speed, and confidence in the WBJEE 2026 exam.

WBJEE PYQs for De Broglie Hypothesis with Solutions

1.
If the kinetic energies of an electron, an alpha particle, and a proton having the same de-Broglie wavelength are $\varepsilon_1, \varepsilon_2, \varepsilon_3$ respectively, then
- ε1>ε3>ε2
- ε1 = ε2 = ε3
- ε1<ε3<ε2
- ε1>ε2>ε3
View Solution
2.
Two base balls(masses; m₁=100g, and m₂=50g) are thrown. Both move with uniform velocity, but the velocity of m₂ is 1.5 times that of m₁.The ration of de Broglie wavelengths λ(m₁) : λ(m₂) is given by
- 4:3
- 3:4
- 2:1
- 1:2
View Solution
3.
The de-Broglie wavelength of a moving bus with speed $ v $ is $ \lambda $. Some passengers left the bus at a stop. Now, when the bus moves with twice of its initial speed, its kinetic energy is found to be twice of its initial value. What is the de-Broglie wavelength of the bus now?
- $ \lambda $
- $ 2\lambda $
- $ \frac{\lambda}{2} $
- $ \frac{\lambda}{4} $
View Solution
4.
The de Broglie wavelength of an electron is $0.4 � 10^{-10}$ m when its kinetic energy is $1.0\, keV$. Its wavelength will be $1.0 \times 10^{-10}\, m$, when its kinetic energy is
- 0.2 keV
- 0.8 keV
- 0.63 keV
- 0.16 keV
View Solution

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WBJEE PYQs for De Broglie Hypothesis with Solutions

1. If the kinetic energies of an electron, an alpha particle, and a proton having the same de-Broglie wavelength are $\varepsilon_1, \varepsilon_2, \varepsilon_3$ respectively, then

2.Two base balls(masses; m1=100g, and m2=50g) are thrown. Both move with uniform velocity, but the velocity of m2 is 1.5 times that of m1.The ration of de Broglie wavelengths λ(m1) : λ(m2) is given by

3.The de-Broglie wavelength of a moving bus with speed \( v \) is \( \lambda \). Some passengers left the bus at a stop. Now, when the bus moves with twice of its initial speed, its kinetic energy is found to be twice of its initial value. What is the de-Broglie wavelength of the bus now?

4.The de Broglie wavelength of an electron is $0.4 � 10^{-10}$ m when its kinetic energy is $1.0\, keV$. Its wavelength will be $1.0 \times 10^{-10}\, m$, when its kinetic energy is

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1.
If the kinetic energies of an electron, an alpha particle, and a proton having the same de-Broglie wavelength are $\varepsilon_1, \varepsilon_2, \varepsilon_3$ respectively, then

2.
Two base balls(masses; m₁=100g, and m₂=50g) are thrown. Both move with uniform velocity, but the velocity of m₂ is 1.5 times that of m₁.The ration of de Broglie wavelengths λ(m₁) : λ(m₂) is given by

3.
The de-Broglie wavelength of a moving bus with speed \( v \) is \( \lambda \). Some passengers left the bus at a stop. Now, when the bus moves with twice of its initial speed, its kinetic energy is found to be twice of its initial value. What is the de-Broglie wavelength of the bus now?

4.
The de Broglie wavelength of an electron is $0.4 � 10^{-10}$ m when its kinetic energy is $1.0\, keV$. Its wavelength will be $1.0 \times 10^{-10}\, m$, when its kinetic energy is