$A$ photocell is a device used to:

The mass of a planet is half that of the earth and the radius of the planet is one-fourth that of earth. If we plan to send an artificial satellite from the planet,the escape velocity will be,(escape velocity on earth $v_e = 11 \ km \ s^{-1}$) (in $km \ s^{-1}$)

Chlorination of toluene in the presence of light and heat followed by treatment with aqueous $NaOH$ yields:

The position vector of a point lying on the line joining the points whose position vectors are $\hat{i}+\hat{j}-\hat{k}$ and $\hat{i}-\hat{j}+\hat{k}$ is:

The length of the subtangent at any point $(x_1, y_1)$ on the curve $y=5^x$ is

The formula of sodium nitroprusside is .........