Angular Displacement The angle which an object moves around a circle is called the angular displacement. This angle is usually expressed in radians. Hence, there are radians in one complete…

# Category: Physics

How does a capacitor work? When a capacitor is connected across a power source, it starts charging up as current flows in the circuit. Initially when the capacitor has…

What is a capacitor? A capacitor is an electrical component that stores charge. It is usually made by having two parallel plates thinly separated by an insulating material. This…

Why does a orbiting satellite not fall to the Earth? A common misconception among students is that orbiting satellites do not experience gravity. It is argued that since these satellites…

Gravitational Potential and Potential Energy Gravitational potential at a point is the amount of work needed to bring a unit mass from infinity to that point. Gravitational potential is defined…

Concept of a Gravitational Field and Force A gravitational field is a region in which a mass experiences a force. A mass, that is present inside a gravitational field experiences…

Capacitor is an electrical component that stores charge. As charges are stored, potential energy in the capacitor also increases. In this post, I would like to explain how to calculate…

This document contains the common definitions that may be asked in the Cambridge IGCSE examinations.

Radioactive decay is both random over space and time, and radioactive decay is spontaneous.

### Random

Random over space means that given a large number of radioactive nuclei, it would be impossible to predict which nuclei would decay next. Random over time means that you cannot predict when a nuclei would decay at any time.

Given a large number of nuclei, it can be safe to predict that approximately half of the original radioactive nuclei would decay after one half-life. However, the exact number of nuclei decay would not be identical given two samples of equal number of original radioactive nuclei.

The table provides the data for the acoustic impedance and absorption coefficients for muscle and bone. A parallel beam of ultrasound of intensity enters the muscle of thickness 3.0 cm…