Spectrometer I - Refractive index of the prism.

PROCEDURE: I. To determine the angle of the prism 1. The preliminary adjustments for telescope, prism and the collimator are done. 2. The slit is illuminated by a sodium vapour lamp. The prism table is mounted vertically. 3. The refracting edge of the prism placed facing the collimator. 4. The image on one side is seen through through the telescope and the vernier readings (R1) are noted. 5. The image on other side is seen through through the telescope and the vernier readings (R2) are noted. 6. 2A = R1  R2  hence the angle of the prism ‘A’ is determined using A =  II. To determine the angle of minimum deviation 1. The edge of the prism is placed facing away from the collimator. 2. The refracting image is obtained in the telescope. The prism table is slowly rotated. 3. The image moves, then stops and turns back. The position of the image where the image stops and turns back is the minimum deviation. 4. The vernier readings (R3) are noted at this position and the direct ray reading (R4) are noted. 5. D = R3  R4  hence the angle of minimum deviation ‘D’ is determined using D =  www.Padasalai.Net Dist. Sec. TNHSPGTA Kanchipuram Dist. A.

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Young’s Modulus ‘Y’ By Searle’s Method

Aim: To determine Young’s modulus of elasticity of the material of a given wire by Searle’s method. Procedure: i. Arrange the experimental set up as shown in diagram. Attach a zero load (slotted hanger it self) and dead load (E) to the frames of the experimental wire and dummy wire respectively so that the wires become free of kinks and remain vertically straight. ii. With the help of micrometer screw gauge, find the correct diameter of the wire at three different places. At every place two readings of the micrometer are taken while holding it in one position and another perpendicular to it by rotating through 90°. iii. In all, six readings of the diameter of the wire are taken. Hence mean diameter and radius of the wire is found out. iv. Adjust the spirit level so that the air bubble is at the centre. Note down the reading of the micrometer screw (M) attached to it. This is zero reading. (This contains main scale reading ...

laboratory work

Introduction The crucial role of practical work and experimentation in science curriculum is universally accepted. This is more so in chemistry which is an experimental science. Most of the concepts in this area are better understood by doing the practical work. The aims and objectives of practical work in the laboratory can be stated as follows: 1. better understanding of scientific concepts and principles. 2. promotion of basic skills and competencies (procedural and manipulative skills, observational skills, drawing skills, reporting and interpretation skills). 3. awakening and maintaining curiosity in the learning environment. The laboratory work is an indispensable part of chemistry instruction. Despite several laudable efforts in the past, experiments, by and large, have continued to be marginalised in school education, and have not received the due importance. There are several factors which contribute towards neglect of the labora...

Apparatus provided in the kit Are ...

Below is the list of some of the apparatus provided. 1. Small portable box with revolving top for easy access to chemicals and apparatus, replacing big racks. 2. Polyethylene dispensing bottles (squeeze type) to dispense liquid chemicals drop wise avoiding contamination of chemicals. 3. Well plates for fast and easy precipitation. 4. W -tubes for fast gas absorption. 5. Aluminum block for safe determination of melting point and boiling point. 6. Kerosene burner 7. Micro burettes. 8. Plastic droppers for easy transfer of liquids. 9. Miniature glasswares for least consumption of chemicals. 10. Micro filtration unit. 11. Micro spatulas Description of Kit Items

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