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

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

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

Photon of frequency $$v$$ has a momentum associated with it. If $$c$$ is the velocity of light, the momentum is