Dual Nature Of Matter

An -particle, a proton, and an electron have the same kinetic energy. Which one of the following is correct in case of their De-Broglie wavelength:

Wavelengths of two photons are given as and respectively. Calculate the ratio of their energies .

The work functions of two metals ( and ) are in the 1 : 2 ratio. When these metals are exposed to photons of energy 6 eV, the kinetic energy of liberated electrons of : is in the ratio of 2.642 : 1. The work functions (in eV) of and are respectively.