Which of the following is not added during the extraction of silver by the cyanide process?

$A$ photocell is a device used to:

In the visible region,the dispersive powers and the mean angular deviations for crown and flint glass prisms are $\omega, \omega'$ and $d, d'$ respectively. The condition for getting deviation without dispersion when the two prisms are combined is

When glucose reacts with bromine water,the main product is

$A$ light wave has a frequency of $4 \times 10^{14} \text{ Hz}$ and a wavelength of $5 \times 10^{-7} \text{ m}$ in a medium. The refractive index of the medium is

$\int [\sin (\log x) + \cos (\log x)] \;dx = $