Which of the following factors change as light waves pass from one transparent medium into another? a .Frequency and velocity
b. velocity and wavelength
c. Frequency and wavelength
d. Frequency, wavelength and velocity

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

In a load, the load is paralel to the shaft. n a. angular n b. thrust n c radial n d. none of the above

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?