Use the given relationship to calculate the ionization energy of a strontium atom, given that radiation of 58.4 nm58.4 nm produces electrons with a speed of 2340 km⋅⁻¹ .2340 km⋅s⁻¹. Note that 1 J=1 kg⋅m2⋅s⁻²s⁽⁻¹⁾.