'(Cheryl of the Clue Crew at the Franklin Institute in Philadelphia)  Weather forecasting radar uses this effect because radio waves change frequency like sound waves'
the Doppler effect
D DAY: Weather forecasting radar uses this effect because radio waves change frequency like sound waves
Weather forecasting radar uses this effect because radio waves change frequency like sound waves
Weather forecasting radar uses this effect because radio waves change frequency like sound waves
"D" DAY
the Doppler effect
"D" DAY