What is the energy of a neutron with a de Broglie wavelength of $1 \ \mathring{A}$?

Two large parallel plates are connected to the terminals of a $100 \, V$ power supply. These plates have a fine hole at the centre. An electron having energy $200 \, eV$ is directed such that it passes through the holes. When it comes out,its de-Broglie wavelength will be ............... $\mathring{A}$

De Broglie waves are associated with moving particles. These particles can be .......

The de-Broglie wavelength associated with a particle of mass $m$ moving with velocity $v$ is:

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

An electron in an electron microscope with initial velocity $v_{0} \hat{i}$ enters a region of a stray transverse electric field $E_{0} \hat{j}$. The time taken for the change in its de-Broglie wavelength from the initial value of $\lambda$ to $\lambda / 3$ is proportional to