Which statements describe intensity? Check all that apply.Intensity is the amount of energy that flows in an area per unit of time.Intensity is the number of wavelengths that flow in an area per unit of time.Intensity that is lower than or equal to 85 units can harm human hearing.Intensity that is greater than or equal to 85 units can harm human hearing.Intensity is measured in decibels.Intensity is measured in hertz.