True. He obtains energy then uses it to get more.
Answer:
Control comes with regulating the amount of radiation that a patient is exposed to (using a dosimeter) while accomplishing the task required – such as taking radiology images or irradiating tumor cells. Regulating radiation levels include ensuring the right distance between the patient and radiation source and implementing requisite shielding techniques. The time duration for exposre should be short and radiation sources should also be labeled accordingly.
The correct answer is dynamo theory. The theory that explains the source of Earth's magnetic field is the dynamo theory. This theory proposes the mechanism of a celestial body such as Earth to generate magnetic field.
