Space contains a vacuum. Waves arriving from stars are used to give information about the stars. Which kind of waves do not give information about stars?
- Ainfra-red
- Bradio waves
- Cultrasound
- D$\gamma$-rays
Physics 0625 · IGCSE · Sound
Space contains a vacuum. Waves arriving from stars are used to give information about the stars. Which kind of waves do not give information about stars?