Do protons and electrons have same mass?

If a proton and electron have the same de Broglie wavelength, then

If a proton and electron have the same de Broglie wavelength, then

Can a proton and an electron have the same de Broglie wavelength?

If a proton and electron have the same de-Broglie wavelength, then

If proton and electron have same de-Broglie wavelength then….

When is no. of protons and electrons same in an atom ?

Ratio of masses of proton and electron is

Q 4 Two atoms are said to be isobars if. * (a) they have same atomic number but different mass number. (b) they have same number of electrons but different number of neutrons (c) they have same number of neutrons but different number of electrons. (d) sum of the number of protons and neutrons is same but the number of protons is different.