A laser has a frequency of 5.45x1015 Hz as it travels through a vacuum. What is the wavelength? 5.50x10-8 m
1.82x10-21 m
1.82x107​​​​​​ m
5.50x1022​​​​​ m

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

What is the role of lenses in microscopy?

Properties seen when one one substance changes to another are known as properties