What is the number of waves that pass a fixed ping in a given amount of time?

How is the gravitational force related to the distance between two objects?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank