The magnitude of potential barrier of germanium is about 0.3eV.What does it mean?

What does 10^2 xx 10^5 means?

Calorific value of Hydrogen is 1,50,000 kj/kg . What does it mean ?

Potential difference between two points is 5volt. What do you mean by it?

In a school, 240 children took an exam and 40 % of them got A grade in all subjects. What does it mean?

A capacitor consists of two circular metal disks, each of radius 15cm separated by 0.5mm (a) what is the capacitance of the device (b) what is the magnitude of the charge stored on each disk when the potential across the capacitor is 150V?

A solid cylinder of mass 20kg rotates about its axis with angular speed 100rad s^(-1) . The radius of the cylinder is 0.25m . What is the kinetic energy associated with the rotation of the cylinder? What is the magnitude of the angular momentum of the cylinder about its axis?