Mr. Ali
Photocell working principle class 12
Photocell The photocell (light cell) is a craft technological application of the photoelectric effect. The photocell is a device that converts light energy into electrical energy. It is sometimes called…
Percentage error numerical questions
Error Analysis, Percentage Error *Numerical questions* 1. The width of a road of 20 meters is measured with the help of a 1 meter long rod. What is the maximum…
Dimensions of physical quantities, formula and numericals
Dimensions Of Physical Quantities The dimensions of any physical quantity are those powers which are raised to the basic units to express the unit of that quantity. To write the…
Unit, measurement and basic quantities
Physical quantities All the quantities which are related to any physical phenomena and can be represented by a number and can be measured directly and indirectly are called physical quantities.…
Significant Figures Numericals
Significant figures All the reliable and one doubtful figures included in a measurement are called significant figures. Some rules for calculating significant figures 1. All non-zero numbers are significant. Example–…
How to form a black hole
Black Hole The future of a neutron star depends on its mass. It is estimated that the contraction of heavy neutron stars can occur indefinitely. In the same order, when…
Why octopus blood is blue
Octopus blood Let us talk today about why the color of octopus’s blood is blue and what is the reason for it. After all, what is there in his blood…
Physical world full chapter class 11
Physical world The correct concept of force is given by Newton’s laws of motion. We experience many forces in the micro world as well as in the macro world. Gravitational…
Huygen’s principle, reflection, refraction of plane wave
Huygen’s Principle When we throw a small stone in a calm water pond, waves propagate around the rebound point. Every point on the surface starts oscillating with time. The photograph…
Function of simple and compound microscope
Function of simple microscope A simple magnifier or simple microscope has a converging lens of short focal length. To use this type of lens as a microscope, the lens is…