Which of the following noble gases has the highest polarizability?

Leaves that produce microspores and megaspores are called:

The period of $\sin ^4 x + \cos ^4 x$ is

The wavelength of the first line in the Balmer series in the hydrogen spectrum is $\lambda$. What is the wavelength of the second line?

The angle between the lines whose direction cosines are $\left(\frac{\sqrt{3}}{4}, \frac{1}{4}, \frac{\sqrt{3}}{2}\right)$ and $\left(\frac{\sqrt{3}}{4}, \frac{1}{4}, \frac{-\sqrt{3}}{2}\right)$ is:

In a permanent magnet at room temperature,