BiHAR BOARD CLASS 10 11 12

❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️🙏🙏 छठ पर्व करीब है सभी से निवेदन है ऑनलाइन खरीदारी कम कर उन छोटे दुकानदारों से खरीदारी करे जो आपके भरोसे बाजार,और चौराहे पर बैठे हो। क्यूंकि उनके घर पर्व तभी होगा जब आप उनतक पहुंचेंगे।

छठ पर्व करीब है सभी से निवेदन है ऑनलाइन खरीदारी कम कर उन छोटे दुकानदारों से खरीदारी करे जो आपके भरोसे बाजार,और चौराहे पर बैठे हो। क्यूंकि उनके घर पर्व तभी होगा जब आप उनतक पहुंचेंगे। ❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️

Get ready 😳😳😳

😭😭😭😭😭😭😭 Commercial and chemical names of common chemicals Business Name IUPAC name Molecular Formula chalk calcium carbonate CaCO₃ grapefruit extract glucose C6HO6 alcohol ethyl C₂H5OH caustic potash Potassium Hydroxide KOH eat soda sodium bicarbonate NaHCO₃ lime calcium oxide CaO Gypsum calcium sulfate CaSO₄.2H₂O TNT Tri Nitro Tallinn C6H₂CH₃(NO₂)₃ washing soda sodium carbonate Na₂CO₃ blueberry Copper sulfate CuSO₄ Regards ammonium chloride NH₄Cl alum Potassium aluminum sulfate K₂SO₄Al₂(SO₄)₃.24H₂O slaked lime Calcium Hydroxide Ca(OH)₂ mand starch C6H10O5 laughing gas nitrous oxide N₂O red medicine Potassium permanganate KMnO red vermilion lead peroxide Pb₃O₄ dry ice solid carbon-dioxide CO₂ saltpeter Potassium nitrate KNO vinegar dilute solution of acetic acid CH₃COOH sweet Borax Na₂B₄O7.10H₂O spirit Methyl alcohol CH₃OH slate Silica aluminum oxide Al₂O₃2SiO₂.2H₂O green kasis ferric sulfate Fe₂(SO₄)₃

*वैसे छात्र छात्रा जो 2023 में इंटर या मैट्रिक का फाइनल परीक्षा देंगे उनका परीक्षा फॉर्म भरने का डेट 8 अक्टूबर तक बढ़ गया है ।* *वैसे छात्र छात्रा जो 2023 में इंटर या मैट्रिक का फाइनल परीक्षा देंगे और यदि उनका ओरिजनल रजिस्ट्रेशन में कुछ गलती है तो उसका सुधार आपके कॉलेज/स्कूल में 8 अक्टूबर तक होगा । साथ ही यह ध्यान रखे कि जिनका रजिस्ट्रेशन में गलती है वे सुधार करवाने के बाद अगले दिन फिर से  रजिस्ट्रेशन कॉलेज/स्कूल से ले लीजिए उसके बाद ही परीक्षा फॉर्म भरे ।* 😄😄😄😄😄😄😄😄😄

😍

😘Terminologies in Progressive Wave Motion😍 ➖Amplitude ➖Period ➖Wavelength ➖Frequency ➖Wave velocity ➖Phase or phase angle (O) ➖Phase difference ➖Path difference ➖Time difference 🔹Amplitude (A): The amplitude of a wave is the maximum displacement of any particle of the medium from its equilibrium position. 🔹Period (T): Period (T) of a wave is the time taken by any particle of the medium to complete one vibration during a period (T). 🔹Wavelength (λ): Wavelength (λ) is equal to the distance between two consecutive particles of the medium which are in the same state of vibration it is equal to the distance travelled by the wave by its time period (T). 🔹Frequency (f): It is the number of vibrations made per second by any particles of the medium (f = 1/T). Since the frequency of a wave is a characteristic property of the source which is producing the wave motion, hence, the frequency of a wave does not change when a wave travels from one medium to another medium. 🔹Phase or Phase Angle (Φ): It represents the state of vibration of the particle of a medium with respect to its mean position. 🔹Phase Difference Δ(Φ): It represents the different state of vibration of a particle at two different instants (or) any pair of particles at the same instant. ΔΦ = Φ2 – Φ1. Wave Velocity (v): It is the distance travelled by the wave in one second (v = λ/T). It is determined by the mechanical properties of the medium through which the wave propagates. The velocity of wave motion is measured with respect to the medium, the wave velocity changes when the medium is in motion i.e. speed of sound through air changes when the wind is blowing. ⇒ Check: Sound Waves There are two velocities associated with a wave. One is the wave velocity and the other one is particle velocity (which is the speed with which the particle of the medium vibrate when the wave passes through the medium). 🔹Path Difference (Δx) or (x): It indicates the distance between two points measured along the direction of propagation of the wave through the medium. 🔹Time Difference (ΔT): It indicates the time taken by the wave to travel from one point to another through the medium.

CUSB Link