This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals In Radiology, Subject name: Radiology
Light rays and X-rays have same 
Select and explain. 
A. Velocity, B. Wavelength, C. Energy, D. Frequency
A: Velocity
Answer: A: Velocity 
Explanation: Ans: a (Velocity) Ref: Practical Radiotherapy- physics and equipment 2nd cd/p.9Electromagnetic waves all travel in vaccum with a velocity equal to the velocity of light 3xl08m/s.