Gamma rays. Since they are electromagnetic waves, they travel at the speed of light.
Alpha and beta are not electromagnetic radiation.
The option 'c' is correct answer.
Gamma Ray
Alpha
ernest Rutherford is the answer....
a. an alpha particle
Ionizing radiations are alpha, beta, gamma rays, etc.
Alpha particle has the least penetrating power, beta is next and Gamma has most penetrating power.
Beta radiation is made from electrons (or positrons for inverse beta radiation). Alpha radiation is a helium nucleus, and gamma radiation is a high energy electromagnetic ray.
The gamma ray is not a particle but is just an EM wave that transmits energy.
The gamma ray is not a particle but is just an electromagnetic wave that transmits energy.
In radioactive elements always give alpha, beta and gamma rays. Here beta is negative charge ray .