Solar Cell

  The photovoltaic effect was experimentally demonstrated first by French physicist Edmond Becquerel Q.What is a solar cell? A.A solar cell, or photovoltaic cell, is an electrical device that converts the energy of light directly into electricity by thephotovoltaic effect. Q.Explain the operation of photovoltaic cell. A. The operation of a photovoltaic (PV) cell requires 3... Continue Reading →

Franck Hertz Experiment

Named after its creator James Franck and Gustav Hertz.On December 10,1926, Franck and Hertz were awarded the 1925 Nobel Prize in Physics "for their discovery of the laws governing the impact of an electron upon an atom. Q.What is the use of setting  VG1K at 1.5 volts? A.It is used to accelerate the electrons emitted... Continue Reading →

Wien’s Distribution Law

  Q.Define Wien's  distribution law. A. Wien's approximation also called  Wien's distribution law is a law of physics used to describe the spectrum of thermal radiation frequently called the blackbody function. Q.Define Wien's displacement law. A. Wien's displacement law states that the black body radiation curve for different temperatures peaks at a wavelength inversely proportional... Continue Reading →

Quinck Tube Method

Q.What are Para magnetic substances? A.Substances that are slightly attracted to magnetic field and do not retain their magnetic properties once the field is removed.e.g.-aluminum,antimony,copper. Q.Why do para magnetic substances exist? A.They  exist due to presence of unpaired electrons and due to the realignment of  electron paths caused by external magnetic field. Q.What is susceptibility? A.Susceptibility indicates the degree of... Continue Reading →


The effect was first identified in 1842 by James Joule when observing a sample of iron. Q. What is Magnetostriction? A. Magnetostriction (cf. electrostriction) is a property of ferromagnetic materials that causes them to change their shape or dimensions during the process of magnetization. Q.What are Ferromagnetic substances? A. Materials that can be magnetized by an external... Continue Reading →

Hall Effect

Q.What is Hall Effect? A.When a current carrying conductor is placed in a magnetic field mutually perpendicular to the direction of current a potential difference is developed at right angle to both the magnetic and electric field.This phenomenon is called Hall effect. Q.Define hall co-efficient. A.It is numerically equal to Hall electric field induced in... Continue Reading →

Newton’s Ring Experiment

  Q.What are Newton's Rings? A.Alternate dark and bright rings formed due to presence of air film when plano convex lens is placed on glass plate is called newtons rings. Q.How are Newton's rings formed? A.They are formed as a result of interference between light waves reflected from the upper and lower surfaces of the... Continue Reading →

Bi-quartz Polarimeter

Q.What is Polarimeter? A.It is a device used to measure the angle of rotation of plane of polarisation rotated by an optically active substance. Q.What is specific rotation? A.Specific rotation of an optically active substance at a given temperature is the rotation in degrees of the plane of polarisation of incident polarized beam produced by one... Continue Reading →

Diffraction Grating

Q.What is diffraction? A.The process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the wave forms produced. Q.What is diffraction grating? A.It is an optically flat glass plate on which large... Continue Reading →

Carey Foster Bridge

It was invented by George Carey Foster Q.What is resistance? A.Resistance R=V \ I, where V is the potential difference applied across the wire and I is the current flowing through it due to the potential difference. Q.What is specific resistance? A.Specific resistance of a material is the resistance of one centimeter length of wire whose... Continue Reading →

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