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1. ### Radiation

... ionizing radiation. There are several forms of radiation: Electromagnetic radiation: (Energy in the form of electromagnetic waves or photons... ...

2. ### in which form of heat transfer is a medium not required?

Radiation does not require medium Radiation is transfer of heat through electromagnetic radiation in the heat spectrum. Hot or cold, all objects radiate ...

3. ### Infrared radiation

1) Infrared Radiation is a kind of electromagnetic radiation with a wavelength between 0.7 and 300 micrometres, which is longer...

4. ### Why (3) is not correct?isn't infrared produced? Isn't black body radiation produced?

...emission of line spectrum. Any object, not necessary gas, with a temperature emits electromagnetic radiation. The radiation so emitted is caused by ...

分類：科學及數學 > 物理學 2016年11月04日

5. ### Frequency of Radiation

... the speed of electromagentic wave be 3 x 10^8 m/s Hence, frequency of radiation = 3x10^8/(3/100) Hz = 10^10 Hz = 10 billion Hz 2014-07-24 17...

6. ### why gramma can through paper ???? 20 points

The gamma ray is an electromagnetic radiation pulse—a photon—of very short wavelength. Gamma rays range in energy from...

7. ### the difference between electric field and magnetoc field

...photoelectric effect —the emission of electrons from metallic surfaces by electromagnetic radiation— it is found that increasing the intensity of the ...

8. ### 有甚麼工具或儀器可改善環境中的電磁輻射？

電磁輻射即係electromagnetic radiation﹐由紅外線至到高能量之加瑪射線都屬於此類﹐輻射量可分為自natural及artificial...環境﹐例如有沒有發射站﹐ 污水處理廠或廢 ...

9. ### 什麼是微波..........

...300 GHz) signals. Above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that it is effectively opaque... ...

10. ### 輻射有幾遠

...and neutron is even longer (several metres or more). For electromagnetic radiation, such as X- or gamma rays, ultraviolet, infrared, microwave or ...