Science > Biology > Digestion and absorption in Human > Buccal cavity – Mouth The digestive system in humans consists of an alimentary canal and associated digestive glands. The human alimentary canal (aliment: nourish) is a continuous muscular digestive tube about 8 to 10 m long that runs through the body. It is open at two ends […]
Category: Pure Sciences
Bulk Modulus of Elasticity
Science > Physics > Elasticity > Volumetric Stress, Bulk Modulus of Elasticity In this article, we shall study the concept of volumetric stress, volumetric strain, and bulk modulus of elasticity. Volumetric stress: When the deforming forces are such that there is a change in the volume of the body, then the stress produced in the […]
Applications of Photovoltaic Cell
Science > Physics > Photoelectric Effect >Applications of Photovoltaic Cell Photoelectric cell or photocell or photovoltaic cell is an electronic device which works on the principle of the photoelectric effect and converts light energy into electrical energy. Construction: Photocell consists of an evacuated glass tube containing two electrodes emitter (C) and Collector (A). The emitter […]
Science > Physics > Photoelectric Effect >Numerical Problems on Einstein’s Photoelectric Equation In this article. we are going to study to calculate the stopping potential and maximum kinetic energy of the photoelectron using Einstein’s photoelectric equation. Example 01: A metal whose work function is 4.2 eV is irradiated by radiation whose wavelength is 2000 A. […]
Einstein’s Photoelectric Equation
Science > Physics > Photoelectric Effect >Einstein’s Photoelectric Equation In this article, we shall, derive Einstein’s photoelectric equation and study its use to verify the characteristics of the photoelectric effect of light. Wave Nature of Light: Christian Huygen’s proposed that the light is propagated in the form of a wave. But this theory has a […]
Science > Physics > Photoelectric Effect > Numerical Problems on Photoelectric Effect In this article, we shall study to calculate, Energy of incident photon, threshold wavelength and threshold frequency of metal. Example – 01: The energy of a photon is 2.59 eV. Find its frequency and wavelength. Given: Energy of photon = E = 2.59 […]
Photoelectric Effect
Science > Physics > Photoelectric Effect > Photoelectric Effect It is found that when the light of very short wavelength (or high frequency) is incident on a certain metallic surface of photosensitive material, electrons are emitted by the surface. Most of the metals emit electrons when ultra-violet light is incident on them. However, alkali metals […]
Problems on Specific Charge Ratio
Science > Physics > Photoelectric Effect > Problems on Specific Charge In this article, we shall see problems based on Thomson’s experiment to calculate the specific charge (e/m). Example – 01: In Thomson’s experiment, a beam of electrons travelling at 6.8 x 107 m/s is bent into a circular path of radius 4 cm in […]
Specific Charge Ratio of Electron
Science > Physics > Photoelectric Effect > Thomson’s Experiment In this article, we shall study Thomson’s experiment to find the velocity of the electron in cathode rays and the specific charge ratio of an electron. Concept of Work Function: When an electron tries to come out of a metal surface (atom) the remaining part of […]
Numerical Problems on Poisson’s Ratio
Science > Physics > Elasticity > Numerical Problems on Poisson’s Ratio In this article, we shall study the concept of poisson’s ratio and numerical problems on it. The concept of this constant (Poisson,s ratio) was introduced by physicist Simeon Poisson. When a rod or wire is subjected to tensile stress, its length increases in the […]