Pyrometer which react to all wavelengths of incident radiant energy are known as

Related MCQs

• 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is
• Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be
• The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelength is found from the known rate of energy, which under the same condition would be emitted from a black surface by multiplying with the absorptivity. Above enunciation is known as
• According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
• Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)
• If the amount of radiant energy received per unit area per second from the sun is measured at the Earth, Mars and Jupiter it will be
• At all wavelengths and temperatures the monochromatic emissivity of a white body is equal to
• A black body when hot, emits heat radiation of __________ wavelengths.
• The net radiant interchange per square metre for two large parallel planes at temperatures of 1000?K and 100?K respectively, would be roughly
• If a body reflects entire radiation incident on it, then it is known as