Final answer:
When someone plunges into a black hole, they will experience time dilation and spaghettification. As they approach the event horizon, their clocks will appear to run slower, and the strong gravitational force will stretch and squeeze their body, eventually tearing them apart. The degree of spaghettification depends on the size of the black hole.
Step-by-step explanation:
When someone plunges into a black hole, their experience depends on their distance from the event horizon, which is the point of no return. As they approach the event horizon, the strong gravitational field causes time dilation, making their clocks appear to run slower. If they send out a signal once per second, an observer outside the black hole will see the signal becoming slower and slower until it eventually stops. For someone falling into a black hole, the gravitational force will cause them to be stretched and squeezed in a process called spaghettification. The degree of spaghettification depends on the size of the black hole. In a black hole with a mass several times that of the Sun, the astronaut will be stretched and ripped apart before reaching the event horizon. For massive black holes, the significant spaghettification occurs only after passing through the event horizon.