[A]: Repeated use of CT scanning is harmful.
[R]: IN CT scanning. X-ray is used.

PET scan uses

What is CT scan ?

Write down the uses of CT?

Waves used in ultrasonography scanning

A: Earth's magnetism protects us from many of thte harmful cosmic rays. R: Earth's magnetism is due to a large permagnet magnet inside earth.

A: Earth's magnetism protects us from many of thte harmful cosmic rays. R: Earth's magnetism is due to a large permagnet magnet inside earth.