Mini-Quiz: Doppler Effect Applications for Electromagnetic Waves

1. What does the term "red-shift" mean?

   It is when planets and stars turn redSorry, not correct. Try another button. The color red has shifted over to become blueGood try, but not right. Select another answer. The spectrum of a star shifts toward the longer wavelengthsThat is correct. You understand uses for the Doppler Effect.

2. Why is frequency compensation necessary when communicating with a satellite?

   In order to tune into a changing frequencyCorrect. You are moving up in the world! To compensate for the absorption from the atmosphereOops! Wrong answer. Re-read the question and try again. To prevent others from spying on the communicationsSorry, not correct. Try another button.

3. What is the difference between Doppler radar and regular radar?

   They are the same thingOops! Wrong answer. Re-read the question and try again. Doppler radar tells the speed, while regular radar only gives the distanceThat is correct. You understand uses for the Doppler Effect. Regular radar tells the distance and Doppler radar tells the weatherGood try, but not right. Select another answer.

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