Moving with the same velocity . One of the following has the longest deBroglie wavelength

Moving with the same velocity, which of the following has the longest de-Broglie wavelength ?

When moving with the same velocity which of the following particles has the largest de Broglie wavelength and why ? (i) Electron (ii) Proton (iii) alpha -particle.

Which of the following waves has the longest wavelength?

Moving with the same velocity, which of the following has large wavelength of the matter waves ?

Which of the following E.M waves has the longest wavelength?

Which of the following has longest wavelength ?

Which one of the following state has the longest coastline ?