The presence or absence of light does not affect sound, at least not directly. Cooler night temperatures and change in humidity affect its speed and propagation characteristics but not in the manner you've described.
During the night our atmosphere ends up producing a temperature inversion. This means temperatures increase with height. Therefore when you shout across the lake, sound waves higher up are now traveling faster than those near the surface.
Temperature inversion is the reason why sounds can be heard much more clearly over longer distances at night than during the day—an effect often incorrectly attributed to the psychological result of nighttime quiet.
At night heat content of air is lesser compare to the heat content of the air in the day time and the air particles are more energetic during day time so they can vibrate more and support the sound wave to move faster. Thus, the speed of sound in the day time is high as compared to the speed of sound in the night time.
Hence, the distant sounds can be heard as the sound waves get refracted and reach the receiver which is present at a distant point. During the day, the sound bends away from the ground; during the night, it bends towards the ground. Hence at night, you have additional "sound" reaching you, making it louder.
The intensity of sound will vary at night, sometimes louder and sometimes softer. It has to do with the height and strength of a temperature inversion just above the ground. On clear, calm nights, it is cooler at the ground than higher up.
Brown noise removes higher pitch sounds, which makes it easier to fall asleep and feel more relaxed. You can even listen to brown noise as your “work soundtrack” and improve your focus!
Its added depth and lower waves filter out higher sounds. As a result, you hear more relaxing, lower-frequency sounds.
At night the air directly above the ground becomes cool, with warmer air aloft. This is known as a temperature inversion, and is the key ingredient to the mystery of the loud surf.
Because you listen with your ears and your brain. At night your brain tends to be more relaxed and this helps you focus on the listening experience.
Sound waves travel fastest in solids, then in liquids, and the slowest in gases. Liquids are not packed as tightly as solids and gases are very loosely packed. The spacing of the molecules enables sound to travel much faster through a solid than in gases.
It's usually colder at night - and especially often just before dawn. This means that air pressure is lower, which would affect sound velocity and hence amplitude. There is less ambient noise, hence a higher signal-to-noise (SNR) ratio.
In chilly air, sound is amplified. This is because sound waves tend to refract more when the temperature drops, and they are generally refracted towards the earth. Furthermore, the sound's intensity will be increased.
Why does music sound faster in the morning and slower at night? Because your perceptual time is different. After waking your mind is slower and takes a while to get up to speed, so the music tempo is relatively faster.
Does Noise harm your Brain? Well yes. It turns out, the continuous background noise also known as white noise which comes from machines and other appliances, can harm your brain, it does so by overstimulating your auditory cortex– the part of the brain that helps us perceive sound. And it's even worse in children.
Coined by a 19th century botanist, brown noise emits higher energies at lower frequencies — think strong winds and low thunder. Studies show that brown noise can help induce sleep and relaxation, making it a strong fit for those struggling to fall asleep in noisy areas or drown out their own internal thoughts.
People with anxiety tend to be on high alert... The use of pink or brown noise may reduce their reactivity to those little sounds in their environment and support calming, sleep, or even concentration. The frequencies picked up in pink noise fall between white and brown noise and are also thought to aid in sleep.
Brown noise is a low-frequency background sound that helps people with ADHD focus and feel calm.
Background noise, particularly brown noise, drowns out the distracting chatter of their thoughts. Background noise in general can help people with ADHD when they struggle to focus or relax, because it helps them concentrate on what they're doing rather than racing thoughts or other distractions.
Violet noise is a kind of sound that increases in volume at higher frequencies. Violet noise is also known as purple noise.
Anyway, don't blame the engineer: They're required to blow that horn. The regulation in question is called the Final Rule on the Use of Locomotive Horns—a name that strongly implies they've had just about enough of your bitching—and it requires four blasts 15 to 20 seconds before every crossing.
Trains usually honk loud during night time in order to keep away deadly creatures such as cows, and other wild animals that may be prowling on the track on which the train is approaching.
Since their inception, railroads have sounded locomotive horns or whistles in advance of grade crossings and under other circumstances as a universal safety precaution. During the 20th century, nearly every state in the nation enacted laws requiring railroads to do so.
It's noisy. The brain creates noise to fill the silence, and we hear this as tinnitus. Perhaps only someone with profound deafness can achieve this level of silence, so paradoxically loud.