Which from following colours has highest energy if wave lengths of violet, blue, yellow and red light are 410 nm, 470 nm, 580 nm and 750 nm respectively ?

Which of the following colours of visible light has lowest energy?

Find the energy of third stationary orbit of Bohr's model of hydrogen atom if the energy of ground state is $-E$ J

What is uncertainty in velocity of an electron if uncertainty in measurement of position is 50 pm ? $(m_e = 9.1 \times 10^{-31}\text{kg},\ h = 6.63 \times 10^{-34}\text{Js},\ \pi = 3.142)$