What is the ratio of mass of an electron to the mass of proton ?

Q. Calculate the mass of a proton if the charge to mass ratio of an electron is $1.758820\times {10}^{11}{\text{C kg}}^{-1}$ and it is known that the mass of a proton is 1837 times greater than the mass of an electron.

Q. The ratio of mass of proton to electron is about:

Q. Ratio of masses of proton to electron is nearly:

Q. An electron of mass $m_e$ and a proton of mass $m_p$ are accelerated through the same potential difference. The ratio of the de Broglie wavelength associated with an electron to that associated with proton is

Q. Calculate the ratio between the wavelength of an electron and a proton, if the proton is moving at half the velocity of the electron (mass of the proton $=1.67\times {10}^{-27}kg$; mass of the electron $=9.11\times {10}^{-28}g$).