Atoms
Celestial Bodies
- Space Travel Equipment
- Stars
- Rotation and Revolution
- Relation Between Escape Velocity And Orbital Velocity
- Dwarf Planets
- Difference Between Solar Eclipse And Lunar Eclipse
- Difference Between Equinox And Solstice
- The Escape Velocity Of Earth
- Solar System
- Difference Between Stars And Planets
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- Constellations
Circuits
电路 (diàn lù)
电路 (Diànlù)
电路
通信系统Pdf
二极管
地球科学
电荷
电
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Electricity
电磁波
电磁
静电学
能量
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流体
武力
Force
摩擦
万有引力
热
动力学理论
光
- 镜面反射漫反射
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- 衍射和干涉的区别
磁性
运动
- 运输历史记录
- 速度-时间图
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自然资源
核物理学
光学
Optics
- Reflection of Light and Laws of Reflection
- Concave Lens
- Total Internal Reflection
- Thin Lens Formula For Concave And Convex Lenses
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- Refractive Index
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- Rainbow
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Oscillation
Pressure
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Quantum physics
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Radioactivity
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Scalars and Vectors
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Scientific Method
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Solid Deformation
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Sound
- Sound waves
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- Doppler Shift
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System of Particles and Rotational Dynamics
Thermal Properties of Matter
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Thermodynamics
- Statistical Physics
- SI Units List
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- Carnots Theorem
- Temperature
- Kelvin Planck Statement
- Difference between Isothermal and Adiabatic Processes
Units and measurements
- Density of Air
- The Idea Of Time
- Difference Between Pound And Kilogram
- Difference Between Mass And Volume
- Dimensional Analysis
- Density Of Water
- Time Measurement
- Standard Measurement Units
- Relation Between Kg And Newton
- Relation Between Density And Temperature
- Difference Between Mass And Weight
Waves
- Space Wave Propagation
- Sharpness Of Resonance
- Relation Between Group Velocity And Phase Velocity
- Relation Between Amplitude And Frequency
- Periodic Function
- P Wave
- Destructive Interference
- Transverse Waves
- Travelling Wave
- Standing Wave Normal Mode
- S Waves
- Relation Between Frequency And Velocity
- Reflection Of Waves
- Phase Angle
- Period Angular Frequency
Work, Energy and Power
- Derivation Of Work Energy Theorem
- Conservation Of Mechanical Energy
- Relation Between Work And Energy
- Destruction Caused Cyclones
Physics Experiments
- Determine Resistance Plotting Graph Potential Difference versus Current
- To find the weight of a given Body using Parallelogram Law of Vectors
- To study the variation in volume with pressure for a sample of air at constant temperature by plotting graphs between p and v
- To measure the thickness of sheet using Screw Gauge
- To find the value of V for different U values of Concave Mirror find Focal Length
- To find the Surface Tension of Water by Capillary Rise Method
- To find the Resistance of given wire using Metre Bridge and hence determine the Resistivity of its Material Experiment
- Determine Mass of Two Different Objects Using Beam Balance
- Tracing the path of the rays of light through a glass Prism
- Tracing path of a ray of light passing through a glass slab
- Tornado Bottle
- To find image distance for varying object distances of a convex lens with ray diagrams
- To find force constant of helical spring by plotting a graph between load and extension
- To find focal length of concave lens using convex lens
- To find effective length of seconds pendulum using graph
- To find downward force along inclined plane on a roller due to gravitational pull of the earth and its relationship with the angle of inclination
- To draw the IV characteristic curve for p n junction in forward and reverse bias
- To determine Young’s modulus of elasticity of the material of a given wire
- To determine the internal resistance of a given primary cell using a potentiometer experiment
- To determine the coefficient of viscosity of given viscous liquid by measuring terminal velocity of given spherical body
- To determine specific heat capacity of given solid by method of mixtures
- To determine radius of curvature of a given spherical surface by a Spherometer
- Scope and Excitement of Physics
- Rocket science
- Relationship between frequency and length of wire under constant tension using Sonometer
- To determine equivalent resistance of resistors when connected in series and in parallel
- To convert the given galvanometer of known resistance and figure of merit into a voltmeter of desired range and to verify the same experiment
- To determine minimum deviation for given prism by plotting graph between angle of incidence and angle of deviation
- To compare the emf of two given primary cells using potentiometer experiment
Introduction
无线电波的波长最长可以在电磁波谱中找到。海浪之间的频率300兆赫(高)3千赫(低),有时被定义为3 GHz以上的微波。
无线电波的波长1毫米300 GHz的频率和100公里3千赫频率(Mascoop et al . 2021年)。
像所有其他波、电磁无线电波也像光的速度移动。无线电波是由所有自然现象形成的天体和照明。用于无线电通信的无线电波,计算机网络、导航系统、雷达、广播、和不同的应用程序是人为形成的。
What are radio waves?
海浪产生的无线电发射器和接收通过无线电运营商确定无线电波。这些波有不同的地球的大气中传播。< / p >
< img src = " /资产/问题/媒体/ 1745 - 1660201887. - jpg”/ >
< / p >
Figure 1: Radio Astronomy
长无线电波在大气中的各种障碍和衍射短的无线电波反映地球的电离层,然后回到天空波的地平线。因此,波传播多局限于视觉地平线(Kontar et al . 2019年)。这是由于波长很短视线和旅行。
Usage of radio waves
无线电波被确定使用的电磁辐射在各种现代应用程序和技术。无线电波的频率主要用于收音机,调频,电视,广播调频广播、军事通信、火腿收音机、手机、和计算机无线网络或无线(雷诺兹et al . 2017年)。
这些无线电波用于许多沟通的目的,通过自由通过地球的大气层。
What are bands of Radio Waves
Band | Wavelength Range | Frequency Range |
---|---|---|
Extremely
High Frequency | 1
mm - 1 cm | 30
GHz - 300 GHz |
Extremely
Low-Frequency | >100
km | |
Medium
Frequency | 100
m- 1 km | 300
kHz- 3 MHz |
High-Frequency | 10
- 100 m | 3
MHz- 30 MHz |
Low-Frequency | 1 -
10 km | 30
kHz- 300 kHz |
Super
High-Frequency | 1-
1 cm | 3
GHz- 30 GHz |
Very
Low-Frequency | 10
cm- 100 km | 3
kHz- 30 kHz |
Very
High-Frequency | 1 -
10 m | 30
- 300 MHz |
Ultra
High Frequency | 10
cm - 1m | 300
MHz- 3 GHz |
Table 1: Bands of Radio Waves
How radio waves are created?
无线电波可以创建自然和人为的。海浪由照明或天体是自然产生的无线电波。自然的无线电波是黑体辐射的主要部分是发出温暖的对象(伊斯特伍德et al . 2018年)。波,被用于雷达、导航系统、计算机网络和无线电通信决心人为形成的无线电波。这些无线电波主要是由带电粒子进行加速的质子和电子,像时变电流。
Anatomy of the electromagnetic waves
电磁现象结合极化、吸收、反射、衍射和折射。这些持有的重要性研究无线电波进入空间,甚至在地球表面(萨拉姆,2019)。的能量,为个人提供了执行任务的能力可以有许多形式,也可以改变从一个到另一个类型。势能是表示水大坝产生的能量和电池。人能理解电磁波解剖学,知道物体的运动更好的决心和动能。< / p >
< img src = " /资产/问题/媒体/ 1745 - 1660202530. - jpg”/ >
< / p >
Figure 2: Electromagnetic spectrum’s radio waves
质子和电子的带电粒子有助于形成一个电磁场,当他们都在运动。这电磁场传输一种能量表示为电磁光或辐射(Johnson et al . 2018年)。磁性冰箱磁铁中使用的是静态的,这变化的磁场诱发电场的变化,反之亦然,负责电磁波的形成。这些电磁波与无线电波电磁波谱中不仅可以穿越固体物料和空气也通过真空或真空。
Conclusion
RF(射频)的能量通常是确定的射频波或射频发射电磁能量的形式,电磁铁的频谱的主要部分。他们都是人造和自然形成的电磁能量来源。如果个人成为暴露在非常高的射频波可以伤害他们通过加热的生物组织通过提高身体的温度。这些手机发出的辐射波主要是像emf是被人类的大脑迅速吸收,影响大脑中的神经元和活动。
FAQs
Q1。无线电波产生人为怎么样?
无线电波可以产生在两种波,人为和自然。每个对象包括人体发出无线电波和电磁辐射,取决于物体的温度。
Q2。无线电通信是什么?
为了使用无线电天线接收的信号广播调频或调幅广播电台。这天线拿起无线电信号无线运营商或调谐器调到特定的无线电信号。这是通过使用一个电感器或共振,被认为是一个电路与晶体振荡器和电容有关。
第三季。无线电波传播是什么?
不断移动的无线电波在太空在地球的表面,甚至在不同的频率。无线电波传播主要是研究了极化的电磁现象,吸收、衍射、反射和折射。
第四季度。电磁波的主要属性是什么?
的电磁波以光速移动。这些波不需要任何形式的传播媒介,可以进行衍射和干涉和极化。
Q5。无线电波中使用WiFi吗?
像所有其他无线设备无线也使用相同的原则。它使用无线电频率之间的发送信号设备和它的频率远不同于设备如汽车收音机、天气收音机、无线电话机,等等。
References
Journals
伊斯特伍德,m . W。安德森,M . M。梦露,r . M。Halpnan G。、Barsdell b R。布瑞克,美国。,……&伍迪·d·p (2018)。收音机天空计波长:m-mode ovro-lwa分析成像。天文杂志,156 (1),32。来自:< a href = " https://iopscience.iop.org/article/10.3847/1538-3881/aac721/pdf " target = "平等" rel =“nofollow”> https://iopscience.iop.org/article/10.3847/1538-3881/aac721/pdf < / >
约翰逊,m D。Narayan, R。Psaltis D。布莱克本,L。Kovalev, Y Y。、Gwinn c R。,……& Sironi l . (2018)。人马座A *的散射和内在结构在无线电波段的。《天体物理学杂志》上,865 (2),104。来自:< a href = " https://iopscience.iop.org/article/10.3847/1538-4357/aadcff/pdf " target = "平等" rel =“nofollow”> https://iopscience.iop.org/article/10.3847/1538-4357/aadcff/pdf < / >
Mascoop, j·L。安德森,l D。,温格,t . V。、Makai Z。Armentrout, w . P。巴尔斯,d。和商人,t . m . (2021)。银河H ii区域广播和红外线波长光度函数。《天体物理学杂志》上,910 (2),159。来自:< a href = " https://iopscience.iop.org/article/10.3847/1538-4357/abe532/pdf " target = "平等" rel =“nofollow”> https://iopscience.iop.org/article/10.3847/1538-4357/abe532/pdf < / >
雷诺兹,s P。巴甫洛夫,G G。Kargaltsev, O。Kpngler, N。Renaud, M。& Mereghetti,美国(2017年)。脉冲星风星云和磁星流出:观察广播、x射线和伽马射线的波长。空间科学评论,207 (1),175 - 234。来自:< a href = " https://arxiv.org/pdf/1705.08897 " target = "平等" rel =“nofollow”> https://arxiv.org/pdf/1705.08897 < / >
萨拉姆,a (2019)。一个地下无线电波传播预测模型对数字农业。信息,10 (4),147。来自:< a href = " https://www.mdpi.com/2078-2489/10/4/147/htm " target = "平等" rel =“nofollow”> https://www.mdpi.com/2078-2489/10/4/147/htm < / >
Zawdie, k。、Drob d P。Siskind, d, E。&科克,c (2017)。计算高频无线电波在电离层的吸收。无线电科学,52 (6),767 - 783。来自:< a href = " http://old.ursi.org/proceedings/procGA17/papers/Paper_G38-2 (2170) . pdf”目标= "平等" rel =“nofollow”> http://old.ursi.org/proceedings/procGA17/papers/Paper_G38-2 (2170) . pdf < / >
Websites
美国国家航空航天局,2022年。无线电波是什么呢?来自:< a href = " https://www.nasa.gov/directorates/heo/scan/communications/outreach/funfacts/what_are_radio_waves " target = "平等" rel =“nofollow”> https://www.nasa.gov < / >(检索:2022年6月10日)