What is the wavelength (in nm) of blue light that has a frequency of 6.69 × 10¹⁴ s⁻¹? (c = 3.00 × 10⁸ m/s)

The product formed when bao and h2o  react together is                        ba(oh)2that is  bao + h2o = ba(oh)21 mole of    bao    react  1 mole of h2o  to    form  1 mole  of ba(oh)2

For a collision to be successful you need 2 different objects 

Ithink the answer is 10.576

Hey : )a transition from the first energy level to the fourth energy level