Picking up Stones 2
Pick up the stones each other. The person who picks up the last one wins the game. However, you can not pick up more than twice the amount of stones your opponent has taken. Pick-up puzzle and Fibonacci sequence For … more
Picking up Stones 1
Pick up the stones each other. The person who picks up the last one is lost the game. You can not pick up more than three at a time. The computer thinks like this: Whenever I pick up 1, 2, … more
RGB Color Combination
Three primary colors of light Red, green, and blue are called the three primary colors of light. You can create any color by adjusting the light of these three colors appropriately. red + green = yellow red + blue = … more
Electrolysis of Water
Electrolysis of Water When electrolysis is performed using a dilute aqueous NaOH solution as an electrolyte, hydrogen gas is generated at the cathode (-), and oxygen gas is generated at the anode (+). The reaction equation is as follows. (＋)pole: … more
Graph of Charle’s Law
Charle’s Law Charle’s Law In 1787, French scientist Charle (1746-1823) revealed that increasing the temperature of a gas by 1℃ at constant pressure increases the volume of the gas by 1/273 of the volume at 0℃. This is called Charle’s … more
Energy Band of Metal
Energy band and band gap of atom According to Niels Bohr’s atomic model, electrons subordinate to an atomic nucleus do not have continuous energy. Electrons can only have sparsely defined energies. This is why lines in the atomic model represent … more
Electric Plating
Electric Plating Electroplating is a technique of depositing a thin film of another metal on the surface of a metal. (-) The electrode is connected to the object to be plated, (+) The electrode is connected to plating material such … more
Why does the moon rise 50 minutes later each day?
The reason why the moon rises 50 minutes late every day While the Earth rotates once a day, the Moon moves to the east little by little. So it takes 50 minutes to 24 hours for the moon to be … more
Digital Sampling
Digital sampling All sounds in nature are analog signals. Analog information holds information from all consecutive times. Since it is not possible to record all the values at all times, usually only the values at regular time intervals are recorded. … more
Chemical Cell (Voltaic Cell, Daniel Cell)
Electricity production before Volta Before chemical cells, such as dry cells, there was only one thing we knew as a way to produce electricity. That is rubbing amber, glass, or metal. Voltaic Cell Alessandro Volta (1745-1827) of Italy in the … more
Constant Velocity
Constant motion Constant velocity motion refers to motion with constant velocity. When a force is applied to an object, the object’s velocity changes, so the sum of all the forces applied to the object in uniform motion becomes ‘0’. For … more