In the polar coordinates of the Schrodinger equation,the angle between the radius vector and the $Z$-axis is known as ..........

If uncertainty in position and momentum are equal,then uncertainty in velocity is

The correct form of the $Schrodinger$ wave equation for an electron,as derived by $Erwin$ $Schrodinger$,is:

What is quantum mechanics? Give its primary information.

The mass of an electron is $9.11 \times 10^{-31} \ kg$,and the Planck constant is $6.626 \times 10^{-34} \ J \ s$. The uncertainty involved in the measurement of velocity within a distance of $0.1 \ \mathring{A}$ is:

Find the uncertainty in the position of an electron which is moving with a velocity of $2.99 \times 10^4 \ cm \ s^{-1}$,accurate up to $0.0016 \%$. (Given,$m_e = 9.1 \times 10^{-28} \ g, h = 6.626 \times 10^{-27} \ erg \cdot s$)