# When the kinetic energy of an electron is increased, the wavelength of the associated wave will(1) Increase (2) Decrease (3) Wavelength does not depend on the kinetic energy (4) None of the above

Subtopic:  De-broglie Wavelength |
85%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If the de-Broglie wavelengths for a proton and an alpha-particle are equal, then the ratio of their velocities will be:
1. $$4:1$$
2. $$2:1$$
3. $$1:2$$
4. $$1:4$$

Subtopic:  De-broglie Wavelength |
68%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The de-Broglie wavelength $\mathrm{\lambda }$ associated with an electron having kinetic energy E is given by the expression

(1) $\frac{\mathrm{h}}{\sqrt{2\mathrm{mE}}}$

(2) $\frac{2\mathrm{h}}{\mathrm{mE}}$

(3) 2mhE

(4) $\frac{2\sqrt{2\mathrm{mE}}}{\mathrm{h}}$

Subtopic:  De-broglie Wavelength |
95%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Dual nature of radiation is shown by:

(1) Diffraction and reflection

(2) Refraction and diffraction

(3) Photoelectric effect alone

(4) Photoelectric effect and diffraction

Subtopic:  Photoelectric Effect: Experiment |
70%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength $\mathrm{\lambda }$. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be

(1) $\mathrm{\lambda }\frac{\mathrm{m}}{\mathrm{M}}$

(2) $\mathrm{\lambda }\sqrt{\frac{\mathrm{m}}{\mathrm{M}}}$

(3) $\mathrm{\lambda }\frac{\mathrm{M}}{\mathrm{m}}$

(4) $\mathrm{\lambda }\sqrt{\frac{M}{m}}$

Subtopic:  De-broglie Wavelength |
75%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

What is the de-Broglie wavelength of the $\mathrm{\alpha }$-particle accelerated through a potential difference V
(1) $\frac{0.287}{\sqrt{\mathrm{V}}}$ Å

(2) $\frac{12.27}{\sqrt{\mathrm{V}}}$ Å

(3) $\frac{0.101}{\sqrt{\mathrm{V}}}$ Å

(4) $\frac{0.202}{\sqrt{\mathrm{V}}}$ Å

Subtopic:  De-broglie Wavelength |
56%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

How much energy should be added to an electron to reduce its de-Broglie wavelength from $$10^{-10}$$ m to $$0.5\times10^{-10}$$${}^{}$ m?
1. Four times the initial energy.
2. Thrice the initial energy.
3. Equal to the initial energy.
4. Twice the initial energy.

Subtopic:  De-broglie Wavelength |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The de-Broglie wavelength of an electron having 80eV of energy is nearly
(1eV =$1.6×{10}^{-19}$ J, Mass of electron = $9×{10}^{-31}$Kg Plank’s constant = $6.6×{10}^{-34}$ J-sec)

(a) 140 Å                      (b) 0.14 Å
(c) 14 Å                        (d) 1.4 Å

Subtopic:  De-broglie Wavelength |
56%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If the following particles are moving at the same velocity, then which among them will have the maximum de-Broglie wavelength?
1. Neutron

2. Proton

3. $\mathrm{\beta }$-particle

4. $\mathrm{\alpha }$-particle

Subtopic:  De-broglie Wavelength |
59%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same
(1) Energy

(2) Momentum

(3) Velocity

(4) Angular momentum

Subtopic:  De-broglie Wavelength |
71%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch