The half-life period of a ratio-active element $$X$$ is same as the mean life time of another ratio-active element $$Y.$$ Initially they have the same number of atoms. Then

Which of the following transitions in hydrogen atoms emit photons of highest frequency ?

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate ?

If in a $$p$$-$$n$$ junction diode, a square input signal of $$10$$ $$V$$ is applied as shown

Then the output signal across $${R_L}$$ will be