TED-Ed: Radioactivity: Expect the unexpected - Steve Weatherell

The video explains radioactivity, where unstable nuclei change spontaneously, emitting particles like beta and alpha. Beta particles result from neutron to proton transformation, while alpha particles are helium nuclei. Radioactivity has applications in smoke detectors and medicine, but poses health risks. Gamma radiation, an electromagnetic wave, is used in food preservation and cancer treatment. Ionization from radiation can damage DNA, highlighting the dual nature of radioactivity as both useful and dangerous.

What happens when a neutron in the nucleus changes into a proton?

• The nucleus becomes stable.

• A beta particle is emitted.

• An alpha particle is released.

• A gamma ray is emitted.

Which type of radiation is used in smoke detectors?

• Alpha particles

• Neutrons

• Beta particles

• Gamma rays

How do beta particles assist in medical diagnostics?

• They destroy harmful bacteria in the body.

• They provide energy for medical devices.

• They trace the path of chemicals in the body.

• They penetrate the skin to deliver medication.

What is a key characteristic of gamma radiation?

• It is used to detect smoke.

• It can pass through the human body.

• It is less energetic than visible light.

• It is a type of particle.

What is the most serious effect of radiation on humans?

• It leads to hair loss.

• It causes immediate death.

• It damages DNA.

• It causes skin burns.