In a dentist's office, an X-ray of a tooth is taken using X-rays that have a frequency of 7.94 1018 Hz. What is the wavelength in vacuum of these X-rays

What if? if the temperature near the cliff suddenly falls to 0°c, reducing the speed of sound to 331 m/s, what would the initial speed of the rock have to be (in m/s) for the soccer player to hear the sound of the splash 2.90 s after kicking the rock?

Three charge are arranged as shown in the diagram. the magnitude of the net electrical force acting on the +6 uc charge, rounded to the tenths place, is .

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain