Speed of sound
Why does sound travel faster in water than in air?
Why does baking soda extinguish fire?
Is it just the COâ‚‚ or something more?
Echo formation
Why don't we hear echoes in small rooms?
Why are antacids used for acidity?
How does an “antacid” neutralize stomach pain?
Ultrasound use
How does ultrasound help doctors look inside the human body?
Why does soap not lather well in hard water?
What's special about hard water?
Why does tamarind clean brass utensils?
Old-school cleaning hacks explained.
Infrasonic waves
Can elephants “talk” using sounds humans can't hear?
What is pH and why is it important?
Is it just about acids and bases?
Doppler in sound
Why does a passing train whistle sound higher as it approaches and lower as it leaves?
Why does milk spoil faster in summer?
Is it only about temperature?
Loudness vs intensity
Why does loud music feel “vibrating” in your chest sometimes?
Why is baking soda used in cakes?
What's the “fluffing” secret?
Musical instruments
Why do guitar and violin produce different sounds even on the same note?
Study Materials
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