No, humans do not typically feel or hear anything when a microwave is turned on. Microwaves operate at a frequency of about 2.4 GHz, which is in the radiofrequency range. This frequency is outside the range of human hearing, so we cannot hear the microwaves themselves.
When a microwave oven is turned on, it generates electromagnetic waves (microwaves) that are directed into the cooking chamber. These microwaves excite the water molecules in the food, causing them to vibrate and generate heat. This is how the food gets cooked or heated in the microwave.
Although we cannot hear the microwaves, we may hear other sounds associated with the microwave operation, such as the humming of the microwave's motor or the beeping sound it makes when the cooking cycle is complete. Additionally, some microwave ovens have a built-in exhaust fan that may produce noise when it's activated for ventilation purposes.
As for feeling anything when a microwave is turned on, as long as the microwave is functioning properly and the door is securely closed, there should be no physical sensation or feeling experienced by humans outside the microwave. Microwave ovens are designed with safety measures to contain the microwaves within the cooking chamber, ensuring they do not escape and potentially cause harm.
However, it's important to note that if a microwave is damaged, has a faulty seal, or is misused (e.g., running it with nothing inside), it can lead to microwave leakage, which is a safety concern. Microwaves can be dangerous if they leak, as they can cause burns and other health issues. It's essential to maintain and use microwaves according to the manufacturer's instructions to ensure safe and proper operation.