The de-Broglie wavelength associated with a particle of mass $10^{-6} \ kg$ moving with a velocity of $10 \ ms^{-1}$ is:

The de Broglie wavelength associated with a material particle is ......

Calculate the de-Broglie wavelength of an electron residing in the $2$nd Bohr orbit of a hydrogen atom. (Bohr radius,$a_0 = 0.529 \ \mathring{A}$)

If $a_0$ is denoted as the Bohr radius of the hydrogen atom,then what is the de-Broglie wavelength $(\lambda)$ of the electron present in the $n^{th}$ orbit of the hydrogen atom?

The De Broglie wavelength $\lambda$ of an electron in the $2^{nd}$ Bohr orbit 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 $= 6.63 \times 10^{-34} \, J \cdot s$