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.

Which of the following are guidelines to follow for obtaining accurate observations

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

Newtons view of arrangement of the universe