which of the following is not a characteristic of electromagnetic light waves? a. they can't travel through a vacuum. b. they obey the formula: velocity= wavelength x frequency. c. they can be reflected and refracted. d. they travel at approximately 3 x 108 meters per second through the air.

Drag each item into the proper state of matter category.

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?