normally to give an interference pattern on the screen with five fringes spaced over a distance of 4.8mm. Calculate the slit spacing. [4.92x10ˉ⁴m] 4. In a double slit experiment‚ a laser beam is directed normally at a pair of double slits with a slit spacing of 0.50mm. An interference pattern is observed on a screen placed at a distance of 120cm from the slits at right angles to the line from the slits to the screen. Bright fringes are observed on the screen at a spacing of 1.5mm.
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produced by the body to protect the eye from foreign irritants and keep the eye lubricated while one blinks. Irritants that may find their way into your eye can include the following: dirt‚ pollen‚ sand‚ dust‚ or even an eyelash. The eye will sense the abrasive object when you first blink your eye; which can be extremely irritating‚ or barely felt. Your tear ducts will then secrete a tear in hopes of flushing out the foreign object. Often times the irritant (It may not always be an object) will not be successfully
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Chapter 2 of the Book Income tax only works in developed countries – Australia has a heavily reliance on income tax. Tax = [(assessable income – deductions) x rate] – offsets ( note there is a order for these) –payg(w) (at the very end +- any levies) Taxable Income e.g. the medicare levy is based on your taxable income. Note: The tax free threshold for a resident for part of the year is calculated through a special formula. (pg71 of text book) Deductions
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Krisha A. Aguilar Prof. Ivan Marcelo Duka G-7L BIO 2 RESPIRATORY SYSTEM The Respiratory system consists of organs and tissues that aid the oxygen to travel in the body and emits the waste gases out of the body. It is also called as the oxygen delivery system for it is the system responsible in delivering the oxygen to all parts of the body. The process of breathing‚ the inhalation of oxygen and exhalation of carbon dioxide‚ is called respiration. Respiration can be described
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Sample Structure Purpose Physical Properties Hazards Salicylic Acid Starting Material Appearance: white powder Molar Mass: 138.12 g/mol Melting Point: 1590C Boiling Point: 2110C Density: 1.44 g/cm3 Mildly irritating (pulmonary irritants). Harmful by inhalation‚ ingestion and through skin absorption. Acetic Anhydride Starting‚ Material‚ serves also as the solvent colorless liquid with a smell of acetic acid Molar Mass: 102.09 g/mol Melting Point: -73.1 0C Boiling Point:
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Benzoic Acid and Benzoates in Food‚ Drinks and Medicines Benzoic acid and benzoates are common additives to food‚ drinks‚ medicines and cosmetics‚ and they also occur naturally in many plants. They are useful chemicals in manufactured products because they kill or inhibit both bacteria and fungi and can act as preservatives. Benzoic acid and benzoates are considered to be safe chemicals for humans when they’re used in small quantities‚ but there are at least two situations in which even small
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chemicals used in the experiment. Physical and safety data was obtained through Acros Organics [1]. All chemical structures were drawn on ChemDraw Ultra 8.0 [2]. Precautions taken in lab: Safety goggles were worn in order to protect eyes from harmful irritants. All open chemicals were handled in a ventilation hood. Protective clothing (i.e. long pants‚ closed toed shoes‚ etc.) was worn. All chemicals were kept away from open flames. Material/Chemical List Glassware 25 mL round bottom flask 100 mL
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and isolation which associate with the concept of belonging as it focuses and supports the idea of fitting into society. Although both texts are set in different historical times‚ they both expand on the same misadventure when people living on the ‘fringe’ had to deal with the exclusion and judgements by the white people. In today’s society‚ our perception of belonging and not belonging has changed over time where people now understand the sense of being included‚ being known or connected to something
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Asthma is a chronic disease that affects the airway‚ which are also called bronchial tubes. The bronchioles are responsible for carry oxygen in and out of the lungs. The airways get tighter and get congested due to a build up mucus. About one of fifteen of people that suffered from asthma experienced attack of wheezing breathlessness‚ chest tightness and coughing. There is no cure for asthma‚ but the majority of patients that receive proper treatment can continue with a normal life (Wexler‚ B. 2013)
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the disease‚ but repeated exposure to secondhand smoke‚ air pollution and occupational exposure (to coal‚ cotton‚ grain) are also important risk factors. Chronic inflammation plays a major role in COPD pathophysiology. Smoking and other airway irritants cause neutrophils‚ T-lymphocytes‚ and other inflammatory cells to accumulate in the airways. Once activated‚ they trigger an inflammatory response in which an influx of molecules‚ known as inflammatory mediators‚ navigate to the site in an attempt
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