Final answer:
The low, droning, intermittent noise in a home at night could come from internal sources like appliances or external environmental sounds that become more noticeable when it's quiet. Acoustic reflections and resonances may alter sound perception indoors, making the noise less audible outdoors. Reducing such noises involves using soundproofing techniques or servicing noisy appliances.
Step-by-step explanation:
The source of a low, droning, intermittent noise in a home at night can be attributed to various acoustic phenomena. The quiet of the night enhances the audibility of sounds that usually get drowned out during the day due to other noises. Such sounds can include the hum of appliances like air conditioning units, vibrations from electrical devices, or external environmental sounds like animals or the wind that are only audible when background noise levels are low. The reason you may not hear the noise outside is that other outdoor sounds could be masking it, or the structure of your house could be amplifying the sound within.
Internal acoustic reflections and resonances within rooms can also affect how sounds are perceived, making certain noises seem louder in some areas compared to others. To reduce unwanted hums or drones like from air conditioning units, one can employ methods like vibration isolation pads, soundproofing materials, or by servicing the machine to ensure it operates smoothly without creating excess noise.