How many photons are produced in a laser pulse of 0.561 J
at 545 nm?

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon