Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue l...

Assessment: JAMB UTME - Physics - 1998 Subject: Physics

Question 1 Report

Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue light iv. it travels as a transverse wave
Answer Details
The correct option is: i, ii, iv only Infrared radiation is a type of electromagnetic radiation that has a longer wavelength than visible light, and therefore it is invisible to the human eye. It is commonly known as heat radiation because it is associated with the heat energy that objects emit. Infrared radiation is a type of electromagnetic radiation, and like all electromagnetic radiation, it travels as a transverse wave, which means that the oscillations of the electric and magnetic fields are perpendicular to the direction of the wave's propagation. The statement "its frequency is higher than that of blue light" is incorrect. In fact, the frequency of infrared radiation is lower than that of blue light.
Read lesson note on Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum (WAEC)
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