1.) How many photons are produced in a laser pulse of 0.643 J at 575 nm?
2.)A certain rifle bullet has a mass of 5.01 g. Calculate the de Broglie wavelength of the bullet traveling at 1649 miles per hour. Consult the table of physical constants as needed.
3.) What element forms an ion with an electronic configuration of [Ne] and a −2 charge?
