Heart Pulse Detector
How to use the Heart Pulse Detector Place your finger on the camera and make the entire camera screen red. This application uses the phenomenon that the color of the finger periodically…
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Science simulation
Cell Division Model
Chromosome If you look at the onion root under a microscope, you can see cells of different shapes and sizes, such as cells with a clear nucleus, cells that appear to be…
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Doppler Effect
Doppler Effect We have heard an ambulance sirens and felt that the ambulance is getting closer. When the ambulance approaches, the sirens sound higher, and when they move away, the sirens sound…
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Apparent magnitude, Absolute magnitude, and Distance to stars
Star brightness and apparent magnitude Hipparchus of ancient Greece distinguished the stars in the night sky according to their brightness. He classified the brightest star as ‘magnitude 1’ and the darkest star…
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Light Refraction
You can drag the path of light. Refraction is the bending of a wave caused by a change in its speed as it moves from one medium to another. This occurs because…
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Stellar Parallax – 3D VR
Parallax When an object is close to me, you can use a ruler to measure the distance. But, it is difficult to measure when the object is away from me. In this…
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Structure of Ice – 3D VR
Looking through the VR device, you can observe the 3-dimensional molecular bonding structure of ice.
Serial Parallel Circuit 2
In parallel circuit, The current splits up when it comes to a branch. The current in all the branches adds up to the current in the main part of the circuit. If…
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Transistor application circuit
The above simulation is based on a circuit that actually works. The transistor uses C1815(general-purpose NPN switching transistor). The resistance connected to the base is 100kΩ, and the resistance connected to the…
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Inductor application circuit
An inductor, also called a coil, choke or reactor, is a passive two-terminal electrical component that stores electrical energy in a magnetic field when electric current flows through it. Inductors are widely…
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Galileo’s Pump Problem
Galileo’s Pump Problem A duke living in Tuscany, Italy, in the 17th century, installed a well in the courtyard of the palace. But, duke saw the pump fail to pull water up.…
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Period of Physical Pendulum
A pendulum that vibrates can be classified as ‘simple pendulum’ and ‘physical pendulum’. A simple pendulum is a case in which the angular motion of an object can be ignored, such as…
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