As the frequency of an electromagnetic wave increases, its also increases. a. energy b. wavelength c. speed d. period

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?

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?