Which of the following transitions in hydrogen atoms emit photons of highest frequency ?
$$n = 1$$ to $$n=2$$
$$n = 2$$ to $$n=6$$
$$n = 6$$ to $$n=2$$
$$n = 2$$ to $$n=1$$
We have no find the frequency of emitted photons. For emission of photons the transition must take place from a higher energy level to a lower energy level which are given only in options $$(c)$$ and $$(d)$$.