Maximum amount of oxygen is exchanged from the blood at the . . . . . . .

Which one of the following frequencies of radiation (in $Hz$) has a wavelength of $600 \ nm$?

Out of $13$ cricket players,$4$ are bowlers. In how many ways can a cricket team of $11$ players be formed such that at least $2$ bowlers are included?

The electric field associated with an $e.m.$ wave in vacuum is given by $\vec E = \hat i\,40\,\cos \left( {kz - 6 \times {{10}^8}\,t} \right)$,where $E$,$z$,and $t$ are in $V/m$,$m$,and $s$ respectively. The value of the wave vector $k$ is ....... $m^{-1}$.

The minimum value of $4e^{2x} + 9e^{-2x}$ is

What is the primary purpose of data entry in the context of mathematical analysis?