Question

why would you hear the siren sound of a fire truck clearly in a nearby Barangay during nighttime than daytime?​

Answer 1

Answer: During the daytime, sound travels faster at the earth’s surface since the air molecules are hotter due to the energy absorbed from the earth’s ground. The air molecules at the higher altitude are cooler than those at the earth’s surface, causing sound waves to refract upward. On the other hand, during nighttime, the earth’s surface is cooler and the layer of air immediately above it is also cooler. As a result, sound travels faster at the higher altitude and is refracted or bent towards the ground.

Answer 2

We can hear the siren sound of the fire truck clearly during night time than day time due to refraction of sound.

• A phenomenon of sound where sound waves bend and cause a change in the speed of sound is called the refraction of sound.
• During the day, the air near the surface of the earth is warmer due to which the sound waves are refracted in the sky and because of the warmer temperature and this refraction, the sound waves get lost in the air making it unclear.
• At night, the air near the surface of the earth is comparatively cooler. Because of the cooler temperature of the earth's surface, the sound waves are refracted to the surface of the earth making it clear.
• Therefore, we hear the sound of the siren of a firetruck clearly at night due to the phenomenon of refraction of sound.