4. Which of the following are not able to
travel through empty space?
A. gamma rays
C. sound waves
B. ultraviolet waves
D. light waves
![4 Which of the following are not able to travel through empty space A gamma rays C sound waves B ultraviolet waves D light waves class=](https://us-static.z-dn.net/files/dae/58dafef2f962bedb15e84be81cffe826.png)