Electromagnetic Waves

فهرست عناوین اصلی در این پاورپوینت

فهرست عناوین اصلی در این پاورپوینت

● Light
● What is Light?
● What is Light
● Electromagnetic Waves
● Electromagnetic Spectrum
● Speed of E/M Waves
● c = f * l
● c = f * l ~~~ f = c / l
● Energy in E-M Waves
● Back to Light
● Our Eyes
● Visible Light
● Seeing things
● Polarization
● Polarization Hint
● Polarization
● Color
● Color Reflection
● Color Transmission
● Some Sweet Color Tricks
● Flux
● Illuminance
● Electromagnetic Spectrum

نوع زبان: انگلیسی حجم: 3.65 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 33 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/06/14 09:55:19

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

., light, wave, electromagnetic, color, m, reflect, energy, e, white, emit, pass,

توجه: این مطلب در تاریخ 2019/06/14 09:55:19 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://web.mit.edu/nelsongroup/outreach/docs/Light.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: ., light, wave, electromagnetic, color, m, reflect, energy, e, white, emit, pass,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

light by mike maloney light what is light where does it come from what is light light is a wave or rather acts like a wave. how do we know reflection refraction dispersion diffraction interference polarization what is light light is a special type of wave what we know as light or visible light is actually a type of something called electromagnetic radiation. so what is electromagnetic radiation and electromagnetic waves electromagnetic waves when something creates energy it also emits radiation. depending on the amount of energy the object will emit different types of electromagnetic radiation. when we studied mechanical waves they were all transferred through a medium. what medium is light transferred through light does not need one electromagnetic waves electromagnetic waves are special in the fact that they do not need a medium to propagate through. but what is creating the disturbance what is emitting this energy electrons electromagnetic waves electrons in materials are vibrated and emit energy in the form of photons which propagate across the universe. photons have no mass but are pure energy. electromagnetic waves are waves that are made up of these photons . when these photons come in contact with boundaries e m waves interact like other waves would. electromagnetic waves electromagnetic waves are everywhere. light is only a small part of them radios tvs microwaves light visible uv infrared radiation lasers cd dvd players x rays electromagnetic spectrum speed of e m waves from last chapter we found that v f l we also said that the speed of a wave in a certain medium is always constant. it has been found that the speed of e m waves and light is ۳ x ۱ ۸ or ۳ m s ۶۷۱ mph ۱۸۶ miles per second we call this value c c f l c is constant throughout the universe as long as light is in a vacuum. when it is in other materials c can change but can never be larger than its value in a vacuum. since c is constant all of e m waves will have a corresponding frequency to go along with their wavelength. c f l ~~~ f c l lets find the corresponding frequency ranges for a few of the groups of e m waves. energy in e m waves which waves have more energy radio waves or gamma waves the greater the frequency of an e m wave the more crests pass a point in a certain amount of time therefore the more photons pass that point. this means that more energy moves past that point in a certain amount of time or that the wave contains more energy. back to light so why can we only see a small portion of these e m waves our eyes visible light we now know what we see is part of the electromagnetic spectrum. we know that the light waves enter our eye and stimulate parts of it that cause a electrical impulse to be sent to the brain which creates this visual image. but everything does not emit radiation. how do we see those things and why cant we see a window seeing things we know that when waves run into a boundary they are partially transmitted and partially reflected. light behaves as a wave so it to is reflected. therefore an object does not need to emit photons itself to be seen it just has to reflect light back to our eyes where we can detect it. objects that do not allow light to pass through them are called opaque. objects that allow light to pass through them are considered transparent. objects in between are called translucent. polarization polarization is a phenomenon of light that is used in sun glasses and ۳ d movies. play with the two polarizing filters for a few minutes and note what is happening and see if you can think of any reasons for it. polarization hint light vibrates in all directions. a polarizing filter acts like a picket fence. it only lets certain direction vibrations pass through it. therefore if you pass light through two of them you can completely block the light from passing through. how polarization color different objects may emit different wavelengths of e m radiation so we would see that light as different colors. but why do we see colors in objects that reflect light if you shine a white light on my clothes and it gets reflected why doesn’t all of my clothes appear white when i shine white light through a colored piece of plastic why does it change color color the light we see is know as visible or white light – although it is not that simple. the light is not really white the white we see is a combination of all the colors of the rainbow. remember r o y g. b i v from art class. when all of these light waves are combined we see white light. color reflection so if we see something as white that means … it reflected back all the wavelengths of light to our eyes if we see something as red or blue it reflected only the red or only the blue wavelengths the others were absorbed. and if we see something as black it did not reflect back any of the light. color transmission filters work in a similar way. red filters only let red light thru. blue let only blue light thru. what do you think that uv sticker means on your sunglasses why do they sell those orange glasses that are supposed to reduce glare some sweet color tricks combining colors in art class how does color printing work combining lights why is the sky blue why are sunsets red why is water greenish blue how does ۳ d work why does a cd reflect a rainbow and a mirror does not how can you help people who are color blind others  link to site flux we now know how light behaves but we must measure how strong it is. the rate at which a source emits light is called the luminous …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: ., light, wave, electromagnetic, color, m, reflect, energy, e, white, emit, pass,

این فایل پاورپوینت شامل 33 اسلاید و به زبان انگلیسی و حجم آن 3.65 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/06/14 09:55:19 استخراج شده است.

http://web.mit.edu/nelsongroup/outreach/docs/Light.ppt

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