Subject Answers

A: A PET scanner is used to locate tumours using what we call a radiotracer: a safe radioactive chemical that is injected into the body. A higher concentration...

A: Pressure is defined as the amount of force exerted on a surface per unit area. Equation-wise, it can be written as follows:Now, we have the person’s weight -...

A: The word “terminal” means “extreme” - so terminal velocity means an extreme or maximum velocity achieved as an object falls through the air due to gravitatio...

A: X-rays and gamma rays are both part of the electromagnetic spectrum, with both having high frequencies and short wavelengths. Of the two, gamma rays have the...

A: When a small droplet of water is placed on a phone screen, it forms a curved semi-sphere and so acts as a convex lens. Because of its small curvature, this m...

A: This is what we call a journey-based question, wherein an object is travelling from one starting point to an ending point. Here, a rollercoaster carriage is...

A: Since: I = Q/tTherefore: Q = I/tThe data that we have: I = 5 A                        &n...

A: In order to understand where this negative surface charge is coming from, we have to first understand the concept of friction. When two surfaces are in conta...

A: The half life of a radioactive substance is the time taken for a specific sample to decay by half. This is equivalent to the time taken for the same substanc...

A: There are three main forces acting on a plane that has just begun to enter a turn:1.  WeightWeight is the gravitational force acting on the plane by vir...