Two waves are traveling through the same container of air. wave a has a wavelength of 2.0m. wave b has a wavelength of 0.5m. the speed of wave b must be the speed of wave a.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: