In an $n$-type semiconductor,the Fermi energy level lies

Removal of shoot tips is a very useful technique to boost the production of tea-leaves. This is because

The velocities of two particles $A$ and $B$ are $0.05 \ ms^{-1}$ and $0.02 \ ms^{-1}$ respectively. The mass of $B$ is five times the mass of $A$. The ratio of their de-Broglie's wavelength is

Radioactive disintegration differs from a chemical change in being

Which of the following statements is incorrect?

Carbon,silicon,and germanium have four valence electrons each. These are characterized by valence and conduction bands separated by energy band gaps equal to $(E_{g})_{C}$,$(E_{g})_{Si}$,and $(E_{g})_{Ge}$ respectively. Which of the following statements is true?