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For which of the following particles will it be most difficult to experimentally verify the de-Broglie relationship?

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Important Questions on Dual Nature of Matter and Radiation

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 11
The de-Broglie wavelength of an electron is the same as that of a 50 keV X-ray photon. The ratio of the energy of the photon to the kinetic energy of the electron is (the energy equivalent of electron mass is 0.5 MeV)
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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 12
The de-Broglie wavelength of an electron moving with a velocity c2 (c=velocity of light in vacuum) is equal to the wavelength of a photon. The ratio of the kinetic energies of electron and photon is
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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 13
The de-Broglie wavelength of an electron in the ground state of the hydrogen atom is
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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 15
The threshold frequency for a certain metal is 3.3×1014 Hz. If light of frequency 8.2×1014 Hz is incident on the metal, then the cut-off voltage for the photoelectric emission is approximately is n volt. The value of n is
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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 16
When a 1 cm thick surface is illuminated with light of wavelength λ, the stopping potential is V0. When the same surface is illuminated by the light of wavelength 3λ, the stopping potential is V06. The threshold wavelength for the metallic surface is
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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 17
The work function of a metal is 1.6×10-19 J. When the metal surface is illuminated by the light of wavelength 6400 Å, then the maximum kinetic energy of emitted photoelectrons will be (Given, Planck's constant, h=6.4×10-34 J-s)
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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 18

With 448 mW power used, the number of electrons reaching the anode per second are 1.4×1016, then anode voltage is

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 19
In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be