The most penetrating X-rays are the highest frequency (shortest wavelength) X-rays. They are the most energetic, and we sometimes refer to them as hard X-rays.
alpha, beta, gamma
The most penetrating power is for beta particles compared to those given here.
gamma
the neutrino
gamma
Gamma radiation is the most penetrating form of ionizing radiation. It can pass through most materials and requires dense materials, such as lead or concrete, to effectively shield against it.
The gamma radiation is extremely penetrant.
Of all the three types of radiation (alpha, beta and gamma), Gamma rays are the most penetrating, being able to travel through a few meters of lead.
Gamma radiation is the most penetrating and dangerous form of radiation. It can travel long distances through air and penetrate materials easily, which makes it more hazardous to human health.
Gamma rays are by far the most penetrating of the three types of radiation.
The sound was so penetrating it hurt my ears. There was so much blood, it was penetrating the bandage. The troop was penetrating enemy lines. Sarah Palin's voice is penetrating and grating on my ears.
Because they have the shortest wavelengths