We can block light by placing obstacles in its path, but it’s much more difficult to block sound. why?
sound waves are transverse waves.
sound waves can move through various mediums.
sound waves have high frequencies.
sound waves have short wavelengths.
sound waves have low amplitudes.

What state of matter is ice a. liquid b. element c. solid d. gas

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule