Frequency:is the number of occurrences of a repeating event per unit time.Radiation:Radiation is energy that comes from a source and travels through some material or through space.Interference*: interference* is a phenomenon in which two waves superimpose to form a resultant wave of greater or lower amplitude. Fringes :the edge and outside boundary of something.Waves : wave is a disturbance or oscillation that travels through space time, accompanied by a transfer of energy.Aperture : Aperture is an optical terminology,it layman's term it is called different names such as an opening, hole, or gap.It often refers to an opening in which light is allowed to pass in optical systems such as cameras and lasers. Italian scientist Francesco Maria Grimaldi originated the word "diffraction".He was the first to record accurate observations of the phenomenon(diffraction) in the year 1665.Here are the list of the scientist that has contributed in the study of diffractionĭiffraction occurs when light(beam/ray of light) or other system of waves such as (water waves, sound, electromagnetic waves ( electromagnetic radiation), and small moving particles such as atoms, neutrons, and electrons, which show wavelike properties) passes sharp edges or goes through narrow slits(aperture), the rays are deflected(spread out) and produce fringes of light and dark bands.ĭiffraction effects are classified into either Fresnel or Fraunhofer types.įresnel diffraction is concerned mainly with what happens to light in the immediate neighborhood of a diffracting object or aperture, so is only of interest when the illumination source is close by.įraunhofer diffraction is the light-spreading effect of an aperture when the aperture (or object) is lit by plane waves, i.e., waves that effectively come from a source that is infinitely far away. THE BRAINS BEHIND THE DISCOVERY AND STUDY OF DIFFFRACTION Masinde Masinde Asuquo Uduak Peter Kudaisi Mobolaji
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It is not the easiest to maneuver due to the lack of a swiveling head, but it operates well in general, and the HEPA filtration is helpful for allergy sufferers. It has a bit of trouble with large bits of debris like kitty litter but otherwise cleans nicely. The Hoover WindTunnel bagless vacuum gives you good suction to clean different types of flooring as well as accessories to clean furniture and other areas in your home. Find many great new & used options and get the best deals for Hoover Windtunnel Rewind Vacuum UH70120 USED PART Brush Roll Housing - Clear at the best. That is a nice extra you don’t get with other units in our review that make you keep track of all that yourself. Ultenic T10 Elite review: an affordable self-emptying optionĪ red indicator light alerts you when you need to rinse the vacuum's filter, check for any clogs or empty the canister. Warranty, Returns, And Additional Information. HOOVER UH70120 H T1-WindTunnel Rewind BaglssHOOVER UH70120 H T1-WindTunnel Rewind Baglss Warranty & Returns. If you prefer a bagged model, check out the Kenmore Intuition.īest shop vacuums 2023: leave no mess behind with these heavy-duty cleanersīest robot vacuums 2023: our top 10 for keeping your floors squeaky clean Buy Hoover WindTunnel T-Series Rewind Upright Vacuum, Bagless, UH70120 with fast shipping and top-rated customer service. You can minimize the impact if you empty it outside. That means there is a potential dust cloud when it is time to empty the dust container. It may lose some points with allergy sufferers, though, because it is bagless. The WindTunnel is a true HEPA vacuum, which means it has a specialized filter designed for catching even the smallest dust mites, allergens and other unwelcome particulates. Overall, its cleaning scores were quite good, though – well above average. It also spread out kitty litter a little before picking it up, which is not ideal. It struggled to clean up the flour we spread onto our test flooring, especially on the low-profile, office-style carpeting, but most of them did. Once we began our tests, we found it did a good job picking up cereal, though it pushed the cereal around a bit before cleaning it from hardwood floors. Dimensions: 43.0 inches (H) x 13.5 inches (W) x 13.Right out of the box, the WindTunnel vacuum took a bit of effort to assemble, but this was not especially taxing, and it took approximately five minutes.T-Series WindTunnel Rewind Bagless Upright Vacuum, UH70120 The WindTunnel Rewind's other notable features include an auto cord rewind and on board tools for precision cleaning. A rinsable HEPA filter saves money, too - with no need to buy replacement filters. This helps signal when the dust cup needs emptying and when the filter needs cleaning in order to maintain peak performance. Equipped with a powerful 12 amp motor, the Hoover WindTunnel T-Series Rewind also features a system check indicator. The WindTunnel Rewind combines Dual Path WindTunnel Technology for the best carpet cleaning performance, with the benefits of Cyclonic Technology for strong suction power and less filter maintenance. Test results within accepted variability tolerance of 5%.ĭeep clean those dirty floors with the Hoover T-Series WindTunnel Rewind Upright Vacuum. Upholstery/Dusting Brush - helps get furniture clean System Check Indicator - indicates when the filter needs to be cleaned or checkedĮasy Belt Change System & Brushroll Access - simply flip two levers to change the belt or access the brushrollĪir-Powered Hand Tool - puts hard-to-reach cleaning in the palm of your handġ2" extension Wand - extends reach of the hoseĬrevice Tool - helps clean nooks and crannies No Scuff Bumper - protects furniture when you can't be as careful as you'd likeĥ Position Carpet Height Adjustment - adjust as needed to clean all flooring types easily and efficientlyĨ' Stretch Hose - above-floor cleaning with simple tools Intuitive Power Controls - conveniently positioned where they should be - right at your fingertipsĢ5' Power Cord - vacuum a large room without re-pluggingįabulous Filtration - rinsable filter and high-quality HEPA filter Only 16.5 pounds - light and easy to use with thorough cleaning powerĬord Rewind with 25' Cord - no more winding - gently tap the pedal to activate the 25-Foot Cord Rewind and retract the cord to store neatly inside /rebates/2fip2fHoover-Replacement-UH70120-Windtunnel-Rewind-Vacuum-Cleaner-Exhaust-Hepa-Filter-4400134932f787675649&. Hoover T-Series WindTunnel Rewind Bagless Upright Vacuum, UH70120: Product Details T-Series WindTunnel Rewind Bagless Upright Vacuum, UH70120 Prior to the removal of Navicat for MySQL 11.1.13, you should first log into your Mac with an administrator account, and turn Navicat for MySQL 11.1.13 off if it is running. In this post we will discuss the following questions: (1) What is the correct way to uninstall Navicat for MySQL 11.1.13? (2) How to ensure all its accompanying components are removed safely? And (3) is there a shortcut for both Mac novices and experts to take to accomplish Navicat for MySQL 11.1.13 removal effortlessly? Conventional Steps to Uninstall Navicat for MySQL 11.1.13 for Mac Even for the experienced users, they may also get lost when trying to uninstall a problematic, stubborn or even malicious application. 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That tends to be my opnion, as well, but neither you nor I know whether I'm getting fast speeds to anything other than the Spectrum test servers.īut Google Support on Facebook messenger tells me, no, the Nest WiFi Pro is actually throttling the speed, and this is a known bug. Well, I don't know if I have an issue, do I? You suggest I don't have an issue, it's just that the speed test to the Google Servers is inexcplicably 33% of the speed test to the spectrum servers. Otherwise, I am strongly considering returning my three new Nest WiFi Pro units and ending my relationship with Nest Wifi after 5 years. I guess at this point, I will hope the new firmware upgrade comes soon and fixes WHATEVER the problem is. So it's very difficult to understand whether I actually have a problem or what the problem is, giving all the conflicting information I am getting. And you are also suggesting that the Google Home app is measuring the speed to my phone rather than the speed to me router, which (as I noted above) is not what I understand to be the case and is not what the support folks told me on Facebook Messenger. Of course, none of that worked.Īnd now I have you telling me that my internet speed is actually fine, and it's just the Google Home app that is reporting the wrong speed. This tech support person kept having me doing things like change the DNS settings, move closer to a WiFi point, etc., before they would escalate the case to someone who actually can work on the real problem. On the other hand, when I went to Google Support on their website chat, I got someone to whom I had to explain repeatedly (for over an hour) that this was not a WiFi issue, but rather an issue of the Google Home app's wired speed mismatching the Spectrum technician's wired speed. I don't understand how that works, since the wired speed test does show 950 Mbps, so that's what they told me. But when I contacted Google Support over Facebook Messenger, they said this is a known issue and that the Google Home app is not just reporting the wrong speed, but that the router is in fact throttling the speed for some people, and they are working on a fix to the problem. At least I'm confident that's what was happening with my Nest WiFi router, because I was consistently getting speed test results between 500 Mbps and 800 Mbps, and I'm confident that this is NOT the speed between my phone and the internet, over the WiFi.Īnd you are correct that we are getting a wired speed of over 950 Mbps, so hopefully that is the true speed. However, I have always understood that the speed test from the Google Home app is in fact measure the speed from the ROUTER to the internet, not from my local device. I do understand that when to do a "normal" speed test (e.g., from a web site), it is giving you the speed from your local device to the internet, not the speed from your router to the internet. Unfortunately, I am getting conflicting information from every direction. So why does the speed test tell me I'm getting only 300 megabits? And which one am I really getting throughout my household? The router is definitely passing through almost a gigabit when the Spectrum tester is hardwird into the router. At least that's what it did with the Nest WIFi before I got the Pro.Īnyway, this is really frustrating. That's ridiculously untrue, right? I thought the speed test measures the speed AT THE MAIN WIFI POINT. But then I ran the speed test from the Google Home app again, and the speed according to the app is 302 megabits? So what the heck is going on? Is the Google Home app lying to me? How am I supposed to know what speed I am actually getting?Īddendum: I am on chat with Google Technical Support, and the support person is trying to tell me the speed test results will depend partly on how far away I am standing with my phone. Then they plugged in the Nest WiFi Pro router and tested the speed hardwired into the router, and the speed was 955 megabits. They tested the speed directly from the modem, and it was 958 megabits. Last week I upgraded to the Nest WiFi Pro last week, and ever since then every speed test I have run from the Google Home app tells my I am only getting 200-300 Megabits. I used to have a Nest WiFi, and the app would tell me I was getting between 500 and 800 megabits per second download speed. |
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