Aphoton has a frequency of 268 hz. calculate its energy

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

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

According to newton’s law of universal gravitation, which statements are true? as we move to higher altitudes, the force of gravity on us decreases. as we move to higher altitudes, the force of gravity on us increases. as we gain mass, the force of gravity on us decreases. as we gain mass, the force of gravity on us increases. as we move faster, the force of gravity on us increases.