by experimenting with model “cells.” In this experiment‚ you will use agar cubes to which the indicator phenolphthalein has been added. Phenolphthalein is an acid/base indicator that turns pink in the presence of a base such as NaOH. Thus the surface of the agar cubes will turn pink immediately when put into a NaOH solution. The NaOH will continue to diffuse through the cube and gradually turn the inside of the cube pink. The guiding question for this lab is thus: What determines the efficiency
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A digital storage oscilloscope is an oscilloscope which stores and analyses the signal digitally rather than using analogue techniques. It is now the most common type of oscilloscope in use because of the advanced trigger‚ storage‚ display and measurement features which they typically provide.[1] The input analogue signal is sampled and then converted into a digital record of the amplitude of the signal at each sample time. The sampling frequency should be the Nyquist rate or better to avoid aliasing
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ECT 122 Week 4 iLab #2 Parts: Breadboard DC Power Supply Hand Held DMM Test leads Wire 220 Ω resistor 560 Ω resistor 1.0kΩ resistor 1. State Kirchhoff’s Current Law. The algebraic sum of the currents entering a node is equal to zero. 2. What is the equation for the total current in a parallel circuit? It= I1+I2+I3…. 3. Determine the total current in the following nodes. 1) It= 2mA+4mA+6mA= 0.012x10^-3=12mA 2) I + I1+I3= I2 I= 2mA+4mA= 1mA I= 1mA- 6mA
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Step Down DC to DC Converter Ivana Krezzel T. Almazan and Ruphina G. Gomez Introduction In our world today‚ cellphones‚ and laptops are widely used. For some‚ these things are so important especially for students and employers who work from office. These devices are usually operated with battery. A DC to DC converter is an electronic circuit which converts a source of direct current (DC) from one voltage level to another. DC is not easily being stepped up or down. One of the applications
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cells must divide through mitosis. Cell division happens after the cell is big enough so the daughter cells will be replicated without any flaws. The regulation and amount of materials that can enter and leave the cell is based on how large the cells surface area is. The rate of movement is also determined by the volume of the cell. Many factors like the decline of food and temperature fluctuations can cause the cell to stop dividing. Materials: Plastic Spoon 2 Blocks of agar phenolphthalein Beaker Dissecting
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object and the time taken for a substance to diffuse to its centre. Hypotheses- Part A) The 5x5x2.5mm block will turn clear first as the Surface area to volume ratio is high and the 10x10x10mm block will take the longest to completely diffuse the Acid to its centre. Part B) The flat‚ rectangular block will be the first to completely turn clear due to its high Surface Area/Volume Ratio. When measured‚ the cubic‚ rectangular block will have a significantly higher percentage of diffusion than the sphere
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structuring they picked the most likely hypothesis to explain it. They used a total of six parameters for Pteridinium which included length‚ width‚ wall thickness‚ hollowness‚ overlap‚ and termination. These parameters were used to determine specific surface area to volume (SA/V) ratios for the organism. The control specimen for this study was a modern osmotrophic megabacteria. The SA/V ratios of the ediacaran organisms were compared to the SA/V ratios of these megabacterium to see if osmotrophy was a
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Ligia Ramos 11th Grade HL Biology – Ms. Bartels Due Monday October 21st Limitations on Cell Size Research Question: What is the correlation between surface-to-volume ration and ion exchange and how does this relate to cells? Evaluation of Method and Results: Errors/ Limitations: | Suggestions for improvement: | Impact on Results: | Precision - Human error –cutting cubes freely‚ resulting in very different sized cubes‚ especially for the 1cm x 1cm x 1 cm cubes. All the cubes also had slightly
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ECT 122 Week 5 iLab #1 Parts: Breadboard DC Power Supply Hand Held DMM Test leads Wire 100 Ω resistor‚ 120 Ω resistor‚ 220 Ω resistor‚ 330 Ω resistor 1. Identify each of these circuits. 2. Given the circuit below‚ calculate the values listed below. IT: _64mA__ IA: __18.18mA____ IB: __45.45mA__ VR1: _3.99V___ VR2: __5.99V__ VR3: _5.45V___ VR4: __4.54V___ Ra= R1+R2= 220Ω+330Ω= 550Ω Rb=R3+R4= 120Ω+100Ω= 220Ω Ia= Vs/Ra= 10V/550Ω=
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Author’s Name Instructor’s Name Course Date Mid Latitude Cyclone in Southern Hemisphere A mid latitude cyclone can also be referred to as an extratropical cyclone. As the name mid latitude suggests‚ they are found outside the tropics but before the north and south poles‚ approximately between 23 and 66 degrees on each of the hemispheres or the temperate zones of the earth between the Antarctic and the Arctic Polar Regions and the tropics. A cyclone on the other had refers to a location that
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