A car travels 7,5km west and then 3,4km south. what is the magnitude of its displacement vector​

Wavelength, frequency, and energy are related. what happens to a wave as it’s wavelength gets shorter?

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?