Home » Author Archives: admin (page 18)

Author Archives: admin

Different types of waves in physics with examples

What is wave? Waves transport energy without transporting matter. The energy transportation is carried by a disturbance,which spreads out from a source. We are well familiar with different types of waves such as water waves in the ocean, or gently formed ripples on a still pond due to rain drop. When a musician plucks a guitar-string, sound waves are generated ...

Read More »

Doppler effect formula derivation applications and cases

What is Doppler effect? “The apparent change in the frequency due to relative motion between source and observer is known as Doppler effect.” When a listener is in motion toward a stationary source of sound ,the pitch (frequency) of the sound heard is higher than when the listener is at rest.If the listener is in motion away from the stationary ...

Read More »

First law of thermodynamics equation and applications

First law of thermodynamics definition When heat is added to a system there is an increase in the internal energy due to the rise in temperature,an increase in pressure or change in the state.If at the same time,a substance is allowed to do work on its environment by expansion,the heat Q required will be the heat necessary to change the ...

Read More »

Torque in physics definition formula examples and applications

Definition of torque in physics “The turning effect of a force is called torque or moment of the force.” We open or close a door by pushing or pulling it.Here push or pull turn the door about its hinge or axis of rotation.The door is opened or closed due to the turning effect of the force acting on it. Before ...

Read More »

first and second conditions of equilibrium with examples in mechanics

What is equilibrium in physics? “A body is said to be in equilibrium if no net force acts on it.”Newton’s first law of motion tells us that a body continues its state of rest or of uniform motion in a straight line if no resultant or net force acts on it.For example,a book lying on a table or a picture ...

Read More »

Physics work energy and power Formulas with problems & solutions

What is work? “Work is a task or job ¬†done when a force acts on a body and moves it in the direction of the force.”Generally ,it refers to perform some task or job. How to find work in physics? In science ,work has precise meaning.For example,a man carrying a load is doing work but he is not doing work ...

Read More »

alternative renewable energy

What is solar energy? “Solar energy is the energy coming from the sun and is used directly and indirectly.”The earth receives huge amount of energy directly from the sun each day.Solar energy at normal incidence outside the earth’s atmosphere is about 1.4 kWm-2 which is referred as solar constant.While passing through the atmosphere,the total energy is reduced due to reflection,scattering ...

Read More »

Difference between intrinsic and extrinsic semiconductor

In terms of their electrical properties,materials can be classified into three groups: Conductors Insulators Semiconductors When atoms combine to form a solid,crystalline materials,they arrange themselves in symmetrical pattern.The atoms within crystal structure are held together by covalent bonds,which are created by the interaction of the valence electrons of the atoms. Silicon is a crystalline material.All materials are made up of ...

Read More »

What are the different types of solids?

What are Solids? Material have specific used depending upon their characteristics and properties, such as hardness, ductility,malleability, conducting or magnetic etc. What makes steel hard, lead soft, iron magnetic and copper electrically conducting? It depends upon the structure- the particular order and bonding of atoms in a material. this clue has made it possible to design and create materials with ...

Read More »

What is transformer,types,applications & working principle

“A transformer is an electrical device to change a given alternating emf into a larger or smaller alternating emf.”or “It is a static or stationary piece of apparatus that transfers electric power from one circuit to another having mutual inductance without changing the frequency.”A basic transformer is an electrical device constructed of two coils placed in close proximity to each ...

Read More »