Final answer:
The penetration power of an anode or cathode depends on the context; in a CRT, the anode is struck by electrons to produce X-rays. For emissions, gamma rays penetrate matter more deeply than alpha particles, requiring lead shielding for protection.
Step-by-step explanation:
Regarding which end has more penetration power, it's essential to understand that the anode and cathode refer to electrodes in a circuit and their roles are context-dependent. For example, in a cathode ray tube (CRT), energetic electrons strike the copper anode, resulting in the production of X-rays, highlighting the anode's role in this emission. Additionally, in the context of cathodic protection, the sacrificial anode is typically the metal that will corrode, protecting the cathode material.
When comparing the penetrating ability of emissions, gamma rays are significantly more penetrating than alpha particles. Gamma rays require a thick lead shield for protection, whereas a simple sheet of paper or a human hand can block alpha particles. To protect yourself from these emissions, for alpha particles, basic barriers like paper are sufficient, but for the deeply penetrating gamma rays, specialized shielding such as lead is necessary.