Practice The Speed Of Electromagnetic Waves (10.7)

Practise this section

9 questions

Flashcard drill
2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
What is the speed of electromagnetic waves in a vacuum?
Show hintHide hint
Think about the speed of light.
Question 2.
What is the refractive index?
Show hintHide hint
It's related to how light bends.
3Question 3.
What is the speed of electromagnetic waves in a vacuum?
- 3×10^6 m/s
- 3×10^7 m/s
- 3×10^8 m/s
Show hintHide hint
This speed is often referred to as the speed of light.
4Question 4.
True or False: The refractive index of a vacuum is greater than 1.
- True
- False
Show hintHide hint
Think about how light behaves in a vacuum.
Question 5.
Calculate the speed of light in diamond, where the refractive index is 2.42.
Show hintHide hint
Remember to use the given refractive index in your calculation.
Question 6.
In telecommunications, if an electromagnetic wave travels through fiber optic cable at 2×10^8 m/s, what is the refractive index of the medium?
Show hintHide hint
Use the formula to isolate n and make your calculation.

5 more questions in this section. Enroll free to practise them all.