Physics
Infrasonic vs. Ultrasonic
Infrasonic vs. Ultrasonic The Hook: Humans are partially deaf. We live in a narrow slice of the sound spectrum. While we chat, Elephants are whispering secrets below our hearing (Infrasonic), and Bats are screaming above our hearing (Ultrasonic). 1. The Frequency Ruler Sound is measured in Hertz (Hz) . Here is where humans stand compar…
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Physics
Concave vs. Convex: The Mirror Maze
Concave vs. Convex: The Mirror Maze Look at a shiny spoon. The front side (where you put the soup) turns your face upside down. The back side makes your nose look huge. Welcome to the weird world of Spherical Mirrors. In Physics (and exams), mirrors are not just about vanity. They are about bending light to do a job—either to focus heat or to s…
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