Calculate the wavelength of a photon that has an energy of

Question

Calculate the wavelength of a photon that has an energy of 5.25 times 10^-19 J.s in.nm

What is the energy of a photon in joules when an electron in a h atom jumps from n= 6 to n= 5 level.(4)

What is the wavelength of the photon in micrometers(mm) in which region of the spectum is this photon located?

Which of the following correctly represents the second ioniation of Ca

a. CA (g) arrow Ca + (g) + e^-

^{b. Ca+ (g) + e- arrow} CA+ (g)

c.Ca+(g) + e- arrow Ca(g)

d. Ca+(g) arrow Ca²⁺(g) + e-

e. ca-(g) +e- arrow Ca^2- (g)

is Ca ^{3+ possible why or why not}