In terms of Charle's law explain why `-273^@C` is the lowest possible temerature.

In a chamber , a uniform magnetic field of 6.5 G (1 G = 10^-4 T) is maintained. An electron is shot into the field with a speed of 4.8 xx 10^6 ms^-1 normal to the field. Explain why the path of the electron is a circle. Determine the radius of the circular orbit, (e=1.6 xx 10^-19 C,m-e=9.1 xx 10^-31 kg)

Apart from tetrahedral geometry, another possible geometry for CH_4 is square planar with the four H atoms at the corners of the square and the C atom at its centre. Explain why CH_4 is not square planar ?

A PCR machine can raise temperature upto 100^@C but after that it is not able to lower the temperature below 70^@C automatically. Which step of PCR will be hampered first in this faulty machine explain why?

Auxins are growth hormones capable of promoting cellelongation. They have been used in horticulture to promote growth, flowering and rooting. Write a line to explain the meaning of the following terms related to auxins. a. Auxin precursors b. Anti-auxins c. Synthetic auxins

A paramagnetic gas has 2.0xx10^26 frac(atoms)(m^3) with atomic magnetic dipole moment of 1.5xx10^-23 A m^2 each. The gas is at 27^@C . (If the gas in this problem is kept in a uniform magnetic field of 3T, is it possible to achieve saturation magnetization? Why?