Question

Define emissive power for a black body radiation. Write it's SI unit.
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Answer 1

Answer:

ʜᴇʀᴇ ɪs ʏᴏᴜʀ ᴀɴsᴡᴇʀ ⬇️

Explanation:

ᴀ ʙʟᴀᴄᴋ ʙᴏᴅʏ ɪs ᴀɴ ɪᴅᴇᴀʟ ᴇᴍɪᴛᴛᴇʀ. ᴛʜᴇ ᴇɴᴇʀɢʏ ᴇᴍɪᴛᴛᴇᴅ ʙʏ ᴀɴʏ ʀᴇᴀʟ sᴜʀғᴀᴄᴇ ɪs ʟᴇss ᴛʜᴀɴ ᴛʜᴇ ᴇɴᴇʀɢʏ ᴇᴍɪᴛᴛᴇᴅ ʙʏ ᴀ ʙʟᴀᴄᴋ ʙᴏᴅʏ ᴀᴛ ᴛʜᴇ sᴀᴍᴇ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ. ᴀᴛ ᴀ ᴅᴇғɪɴᴇᴅ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ, ᴀ ʙʟᴀᴄᴋ ʙᴏᴅʏ ʜᴀs ᴛʜᴇ ʜɪɢʜᴇsᴛ ᴍᴏɴᴏᴄʜʀᴏᴍᴀᴛɪᴄ ᴇᴍɪssɪᴠᴇ ᴘᴏᴡᴇʀ ᴀᴛ ᴀʟʟ ᴡᴀᴠᴇʟᴇɴɢᴛʜs.ᴛʜᴇ ᴜɴɪᴛs ᴏғ ᴛʜᴇ sᴘᴇᴄᴛʀᴀʟ ᴇᴍɪssɪᴠᴇ ᴘᴏᴡᴇʀ ᴀʀᴇ ᴡ/(ᴍ2 μᴍ).

Answer 2

Answer:

The spectral emissive power is the rate of thermal emission per unit surface area per unit wavelength. If the wavelength of the radiation is in , then the units of the spectral emissive power are W/(m2 μm).

Explanation:

What is the emissive power of a black body?

A black body is an ideal emitter. The energy emitted by any real surface is less than the energy emitted by a black body at the same temperature. At a defined temperature, a black body has the highest monochromatic emissive power at all wavelengths.

What is the SI unit of emissive power?

SI radiometry units

Quantity. Unit

Name. Symbol. Name

Radiant energy Qe joule

Radiant

energy density we joule per

cubic metre

Radiant flux Φe watt

hope it will help you