Final answer:
The type of noise encountered when distracted by the sounds and smells of dinner preparation is environmental noise, caused by stimuli in one's surroundings that capture attention.
Step-by-step explanation:
When you're distracted by the smells and sounds of dinner being prepared while trying to focus on a recorded micro-lecture, you are dealing with environmental noise. This type of noise stems from your surrounding environment and is similar to an experience you might have in a restaurant when a sudden, unexpected sound, such as breaking glass, captures your attention. This occurrence is known as bottom-up attentional capture, where your senses are drawn to particularly noticeable environmental stimuli, overriding your focus on other tasks.