Who said "Atoms can neither be created nor destroyed"?

High energy waves have short wave lengths, true or false?

A wave travels an average distance of 6 meters in 3 seconds. What is the wave's velocity?

Which of the following best describes a property of water? A. Weak cohesive forces exist between its molecules. B. It cannot make many solutions C. It is a liquid over a wide temperature range. D. Little energy is needed to raise its temperature.

On April 13, 2029 (Friday the 13th!), the asteroid 99942 mi Apophis will pass within 18600 mi of the earth-about 1/13 the distance to the moon!

if a stone with an original velocity of 0 is falling from a ledge and takes 8 seconds to hit the ground what is the final velocity of the Stone

Dr. Halite combined sodium metal with chlorine gas to make sodium chloride (table salt). the chemical reaction used up all of the metal and all of the gas. If Dr.

Which planet, when viewed through a telescope, appears as a reddish ball interrupted by some permanent dark regions that change intensity?

A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed? a. 50 mm/s b. 50 hertz's c. 2 mms d. 0 0.50 mms

Suppose you illuminate two thin slits by monochromatic coherent light in air and find that they produce their first interference minima at / pm 35.09 degrees on either side of the central bright spot.

Tala wants to create a sound echo. She can create the echo using a pane of glass or a carpet square. Which one does she choose? Explain.