Conduction of heat - IGCSE/Edexcel/AQA/ @physicspartner

Uploaded November 2020 | Updated September 2026, 2 weeks ago

This video is made to explain conduction of heat.
Very useful for the IGCSE, Edexcel and AQA students in order to understand the concept

For online classes, please leave your email address in the comment box, we will contact you

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$Spectroscope – Function and applications Please dont hesitate to send an email for comments, advices, recommendation, even for support and classes. My email address is here thephysicspartner@gmail.com Latest Research on this topic https://www.azooptics.com/Article.aspx?ArticleID=1984 https://blogs.iu.edu/sciu/2017/06/13/spectroscopy-astronomy-to-art/ Spectroscopy is the technique of splitting light (or more precisely electromagnetic radiation) into its constituent wavelengths (a spectrum), in much the same way as a prism splits light into a rainbow of colours. However, in general, a spectrum is generally more than a simple ‘rainbow’ of colours. The energy levels of electrons in atoms and molecules are quantised, and the absorption and emission of electromagnetic radiation only occurs at specific wavelengths. Consequently, spectra are not smooth but punctuated by ‘lines’ of absorption or emission. Old style spectroscopy was carried out using a prism and photographic plates. These days, modern spectroscopy uses diffraction gratings to disperse the light, which is then projected onto CCDs (Charge Coupled Devices) similar to those used in digital cameras. The 2-dimensional spectra are easily extracted from this digital format and manipulated to produce 1-dimensional spectra like the galaxy spectrum The precise position (wavelength) at which known emission and absorption lines are detected can be used to measure the redshift of the observed object. For example, if the Hβ (486.2 nm) hydrogen line is detected at 487.8 nm, we calculate that the object has a recession velocity of 1,000 km/sec. Apart from measuring distances, this type of analysis can also be used to detect spectroscopic binaries and extrasolar planets. The widths of both the absorption and emission lines can be used to measure the internal velocity dispersion of complex objects (e.g. the average velocity of stars within galaxies). This is achieved through measurement of spectral line broadening from which the velocity broadening can be calculated. Many (indeed most) absorption and emission lines are produced by metals. The depths or heights of these lines can be used to estimate the abundances of the metals responsible. In stars, these also permit the measurement of the temperature and pressure of the stellar atmosphere. In objects such as galaxies, they permit an estimation of age, though the spectra are somewhat susceptible to the age-metallicity degeneracy making this a difficult procedure. Finally, the overall shape of the spectrum contains clues to many other aspects of the observed population including age and interstellar reddening (extinction). The enormous quantities of information contained within a single spectrum makes spectroscopy one of the most powerful tools at an astronomer’s disposal.$ $Demonstrating wave phenomena - The lab activities Please dont hesitate to send an email for comments, advices, recommendation, even for support and classes. My email address is here thephysicspartner@gmail.com Please support me by subscribing my teaching channel as well. https://www.youtube.com/@teachingpartner Demonstrating Wave Phenomena To demonstrate wave phenomena such as refraction, reflection, and diffraction, various lab activities can be conducted using different materials and equipment. Heres how these phenomena can be demonstrated using a glass slab, mirror, and ripple tank: Reflection Reflection occurs when waves bounce off a barrier and change direction, similar to how light reflects off a mirror. In a ripple tank, reflection can be demonstrated by placing a straight barrier (e.g., a metal strip) in the tank. When waves encounter the barrier, they bounce off it and change direction, illustrating the principle of reflection . Refraction Refraction happens when a wave changes direction as it passes through a boundary between different materials, like light bending as it passes from air to water. In a ripple tank, refraction can be demonstrated by showing how waves change speed when traveling from deep water into shallow water or vice versa. Submerging a sheet of glass in the water to provide an area of shallower water can help illustrate this phenomenon. When waves encounter the boundary between deep and shallow water, they change direction, demonstrating refraction . Diffraction Diffraction can be shown in a ripple tank by placing small barriers and obstacles in the tank. When water waves encounter obstacles or barriers, they can be seen to spread out, demonstrating the principle of diffraction. This can be observed as the waves spread out when encountering obstacles or the edge of an obstacle in the tank . In addition to the ripple tank, other materials such as glass slabs and mirrors can also be used to demonstrate these wave phenomena. 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Finding the specific latent heat using electrical methods - Lab Experiment