What is Guayule?

The principal value of ${\sin ^{ - 1}}\left( { - \frac{1}{2}} \right)$ is

Which of the following is used for making optical instruments?

The practical purpose of classification of living organisms is to

An inductor of inductance $L=400\,mH$ and resistors of resistance $R_1=2\,\Omega$ and $R_2=2\,\Omega$ are connected to a battery of emf $E=12\,V$ as shown in the figure. The internal resistance of the battery is negligible. The switch $S$ is closed at $t=0$. The potential drop across $L$ as a function of time is

What is the wavelength of light with a frequency of $100\; Hz$?