Mary's class is studying sound waves. mary played two sounds on her flute. for the first sound, mary blew gently. for the second sound, mary blew into the flute with a lot of force. what change can you hear?

What are similarities and differences between refraction, reflection, diffraction and absorption?

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3