He happened to leave a petri dish open and discovered a big stuff!
Let’s introduce a coincident scientific discovery. Fleming, who was a medical doctor, searched for substances with effective bactericidal action on […]
Category: Physics
Nobel prize in physics in the year of 1901: The first prize in physics
Wilhelm Roentgen received this award for “Discovery of X-rays”. People would think that he focused on studying X-rays in his […]
If opposite charges are supposed to attract each other, why don’t electrons fall into the nucleus?
I found this question in Quora.com, and it was asked by an eighth grader. I don’t know how that student […]
Your age and hearing ability!
How high frequency do you hear? Human could hear sound from 20 Hz to 20,000 Hz, but if one ages, […]
Back to the future part 4
Maybe you have thought why wheels sometimes appear to spin backward. This is so called the stroboscopic effect. Of course, […]
Gravity and attractive force
What we feel on the earth is the composition of the gravitational acceleration and centrifugal action of earth’s rotation. The […]
Resistors, battery, and power dissipated!!
Quiz: There is a circuit with a battery and a resistor, R. The original voltage of the battery is V […]
What is horse power?
Power is energy per unit time. That’s the efficiency of work. Now here is a question. Which horse power is […]
Physics of rainbow
A rainbow appears in the heavens opposite to the sun and it is caused by the refraction and reflection of the sun’s rays in water droplets. […]
Why is a diamond so glittering?
The surface of the diamond is cut in a particular angle. As a result, when light enters the diamond, the […]