According to the wave-particle duality of matter by de-Broglie,which of the following graph plots presents the most appropriate relationship between the wavelength of an electron $(\lambda)$ and the momentum of an electron $(p)$?

What is the de-Broglie wavelength associated with the hydrogen electron in its third orbit?

The de Broglie wavelength of an electron moving with a velocity of $1.2 \times 10^5 \, ms^{-1}$ is ...... .

The wavelength of electrons accelerated from rest through a potential difference of $40 \, kV$ is $X \times 10^{-12} \, m$. The value of $X$ is $......$. (Nearest integer)
Given:
Mass of electron $= 9.1 \times 10^{-31} \, kg$
Charge on an electron $= 1.6 \times 10^{-19} \, C$
Planck's constant $= 6.63 \times 10^{-34} \, J \cdot s$

Write about the dual behaviour of matter.

If travelling at equal speeds,the longest wavelength of the following matter waves is that for a :