Radioactive materials are used in smoke detectors. as the smoke comes in-between the radioactive source and the sensor, an alarm goes off. which type of radiation should be used in a smoke detector? alpha particles beta particles gamma rays positron particles

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter