Name the component of sunlight that mainly carries heat with it.

25 How much solar energy will be received by 1m² area in one hour, if the solar constant were 1.4 kilowatt per square metre? 26 What is the range of the wavelength of electromagnetic waves that constitutes visible radiation? 28 Name any two components of solar radiation that are not visible to us. 29 Name the type of radiation emitted by a hot electric iron?