precautions for reflection experiment

Take a medium size beaker. Draw arrows on one piece of of card or paper. reflection on pendulum experiment. This is basic formula helps you out while doing unknown dilutions. For many years they have been used for keeping time. In the study, an authority figure ordered participants to deliver what they believed were . Produce the line to meet MN at B as shown in the diagram above. Vb is the Volume of base used. (1)the incident ray, Normal and reflectedray all lie in same plane. The time difference between diffusion in normal water and cold water was still obvious, even though the temperature difference was not as great hot water to normal water. As our seed is germination we need a seed. Step 3 - Slowly lower the piece of paper behind the glass of water. Slowly pour water into the glass until you see a second coin appear on the other side of the glass when you see from above. Some common precautions depending on situation: 1. Put an iron nail in a dry test tube and label it C and plug with a small piece of cotton wool on which a few pieces of calcium chloride are placed. Then we can solve the . Now try to think of a word that still makes sense if you put it behind the glass. Do not put the entire beverage solution into the beaker filling it up to the rim because you have to save the space for ninhydrin solution as well. 2. Gram staining is the most important differential staining method used in microbiology. During the 1960s, Yale University psychologist Stanley Milgram conducted a series of obedience experiments that led to some surprising results. If the amplitude of motion of the swinging pendulum is small, then the pendulum behaves approximately as a simple harmonic oscillator, and the period T of the pendulum is given approximately by; T=2l/g Where g is the acceleration of gravity. 2. View results. Study Guides . The distance between the pins P and Q or the pins R and S, about 5 cm gap should be maintained. The smear is flooded with the mordant, gram's iodine, for 1 minute. Experiment #1: Refraction, Reection, and Ray Tracing Carl Adams September 9, 2011 1 Purpose In the rst part of this lab, you will verify Snell's law of refraction and use it to measure the index of refraction of a glass block. Stick the note to a blank wall. Position your head so that you see the coin from the side of the glass (not from above). Movement should also be limited to essential trips. Pendulums (or pendula if we are being exact!) Sources of errors when working with experiments dealing with light. . Place two dots far apart on the incident and refracted light beams to accurately locate the beams 5 Extra Credit *Refraction is the bending of a wave as it passes from one medium to another. 3 things i have learned: -when the length increases, the period becomes longer. Calcium chloride is a drying agent. ; Never use chemicals, gases, or reagents without labels. n' n incident ray reflected ray refracted ray N ' Figure 1 The law of reflection states that "the angle of incidence equals the angle of . For example, refraction occurs when a beam of light travels through the air before reaching the polished surface of a glass prism. What are the precautions in the reflection experiment? Week 1 Reflection; Newest. The meter ruler (uncertainty of 0.05cm) and the digital balance (uncertainty of 0.1g) had uncertainty's which could have altered the accuracy of the results. -the mass of the pendulum bob affects the time taken to complete one full ocillation. Materials and Equipment Computer with Internet access Color printer Digital camera Typical office/hobby/hardware/craft supplies (paper, poster board, glue, wood, etc.) Step 2. Excess stain is washed away from the smear under gently-flowing tap water, in such a way that, water does not fall directly on the smear. 4. Method Set up a ray box, slit and lens so that a narrow ray of light is. In this example, the glass has a specific refractive index, which will determine . Expert Answers | Certified Educator The best way to demonstrate the laws of reflection involves a narrow, bright beam of light to shine on reflective surfaces; for this a laser works very nicely. Precautions. Answer (1 of 2): I'm assuming you are talking about subjecting an object to variable forces up to and including the limit of static friction beyond which the object starts moving, Precaution-wise know ahead of time where and how the movement will occur and what are the worst consequences of if fa. Put an iron nail in one test tube and label it A and a steel nail in another tube label it B. Method. 1 Comment. The drawing board should be soft so that pins can be easily fixed on it. Reflections on my first implementation of Modeling Instruction for high school biology and chemistry courses Monday, August 18, 2014 Unit 1 Reflections: Seed Germination Lab I feel unit 1 has taken an excessive amount of time. Na is the concentration of acid Na is the Number of moles of acid in balanced equation for reaction. Lab Manual Class 10 Science Multiple Choice Questions. Instructions. 2. Steps to Perform Ohm's Law Experiment. Newton's Ring experiment? Take the triangular shaped shiny piece that looks like silver metal. Procedure Tape your mirrors together so that they can be opened and closed like a hinge. Part 3 3. One arrow near the top and one arrow near the bottom. 2. Limit close contact - Distance from one another must be observed at all times. The other variables were controlled as best as could be expected. Remove the mirror and the pins P3 and P4. Keep the jar undisturbed and covered during the experiment. Precautions. Set the light to emit only one . The angle of incidence is equal to the angle of reflection. The angle of incidence should be between 30 and 60. Reflection Some difficulties encountered through the experiment, were the precision cutting need to cut all the apple wedges to identical sizes, avoiding the cross-contamination of all the different solutions and the even distribution of solution on each wedge of apple. For this we have used gram seed. Chemicals. The radiation undergoes a change in speed, in wavelength, and in direction. 15) water bath. I would have liked to have been done with unit 1 by the end of last week.. instead, we'll be testing this Wednesday. This second line will be normal, 90 degrees to the first line. Soft board and pointed pins should be used. You want to leave a slight gap between the two edges (around 1/16th of an inch) to do this. Make sure that each arrow points in a different direction. Question 1: In the experiment to trace the path of a ray of light through a rectangular glass slab using pins P 1, P 2, P 3 and P 4, four students did the following: A. Using pins. the law of reflection (snell's law) states that the ratio of the sines of the angles of incidence and refraction is equivalent to the ratio of velocities in the two media, or equivalent to the opposite ratio of the indices of refraction: during the course of analyzing our data, we calculated the index of refraction for the plastic lens and The hot water I used for this experiment was about 70.5 degrees Celsius, but the normal water was only about 19 degrees Celsius. of refraction. This simple sugar (glucose) is later converted to starch. are a fascinating scientific phenomenon. Perform a linear fit on the graph. Photosynthesis is a biochemical process by which green plants s5mthesize simple sugar in the presence of sunlight using carbon dioxide from the atmosphere and water from the soil. After that, we decant the petroleum ether to get the solid portion and liquid portion. Let it boil up for 4-5 mins remove the test tube safely out . Precautions - Paper Chromatography. If possible, work remotely or stagger shifts to minimize the number of people in the lab. The incident ray, the normal and the refracted ray all lie on the same plane. Procedure Step 1. Make the arrows point in the same direction. All pins base should be in a straight line. Reflection is defined as the reversal in direction of a particle stream or wave upon encountering a boundary. carefully monitored from incorrect recording. By performing these techniques, we examined our solutions such as SiO2 (sand), NH4Cl (ammonium coloride), and NaCl (sodium chloride) and mixed H2O (water) with each solution after . Another precaution is when carrying out the titration, the alkali soluti. Precautions Use good quality pencil for drawing the reference line so that the mark does not dissolve in the solvent in which the chromatography is carried out. Light Refraction Science Experiment Instructions. Make sure that all chemicals in the laboratory have proper labels. The distance between the pins should be 5cm or more. LAW PRECAUTION THAT CAN BE TAKEN a. I have found that the experiment did have many errors which could have been improved. Place the paper behind the glass and watch as the arrow points the other way. 6. Guiding the activities insures that students get off to a good start It is good to use color Popsicle stick. There were both systematic and random errors involved in the experiment. -i learnt how to record the time taken for one period or one full oscillation to happen. You'll get the best results with a clear, glass container for this experiment. Next, fill up the water bottle. To investigate the reflection of light by different types of surface, and the refraction of light by different substances. 3. Theology - yea; Leadership class , week 3 executive summary; EKG Review for ICU clinical; Biomol Project Report; I am doing my essay on the Ted Talk titaled How One Photo Captured a Humanitie Crisis https; School-Plan - School Plan of San Juan Integrated School; ANSC 422 Lecture 2 - Dr. Kleinman; ANSC 422 Lecture 1 . Next, we need to evaporate the petroleum ether. Half fill two test tubes with water. The Pendulum Experiment is an experiment about gravity. The rectangular glass slab used should have perfectly smooth faces. The name comes from the Danish bacteriologist Hans . When light passed from air into a denser medium, the ray of refraction bent towards the normal. Created By Shanon Bosco. There are experiments which can be conducted to prove that indeed osmosis occurs, making use of apparatus and things like potato or yam.. (ammeter, volmeter, measuring cylinder, ruler) b. If not a normal 15 cm scale can also be used. Take into account zero error of instrument. Using small angles of incidence will result in large percentage errors. The analyses of the mixture were to distinguish and identify homogeneous mixture by using the techniques of decantation and sublimation. Here are two methods for vertically mounting a plane mirror so that it stands upright on a sheet of paper. For drawing the boundary of the prism, a sharp pencil should be used. Make sure the spring is not loaded beyond the elastic limit. SIN <i SIN <r. SIN <i = SIN <r K. SIN <i = SIN <r 1.4797. This piece has two curved and one plane mirror side. What are some precautions in an Reflection lab in Physic?s Answer 5 people found it helpful Brainly User HELLO PRECAUTIONS Use sharp needle and pencil Mark properly and draw straight line Do not move the lab while marking.. Tnxx Advertisement Answer No one rated this answer yet why not be the first? The growth of the plants over time was the dependant variable (The dependant variable is the total growth). Fix two other pins P3 and P4 such that they appear to be a straight line with the images of P1 and P2.

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