Question

Across the world, the use of thermometers to check human temperature is considered to be one of the tools to screen for the virus COVID-19. Some of these thermometers are able to detect temperature from a particular distance, therefore, preventing close contact between humans and the spread of the virus. Such thermometers are able to sense a specific energy (electromagnetic radiation) emitted by the human body.

a) Name this electromagnetic radiation (EMR) that is emitted by the human body.

b) Based on your answer in a), does this EMR have a lower or higher frequency than the x-ray radiation used in medical equipment. Justify your answer using frequency range of both EMR.

c) Based on your answer in a), does this EMR have a shorter or longer wavelength than the visible radiation. Justify your answer using wavelength range of both EMR.

d) State the relationship between frequency, wavelength, and energy of electromagnetic radiation.

e) If the energy of the EMR emitted from a COVID-19 patient with high fever is 9.94 x 10-24 kJ, calculate the wavelength (in nm) and frequency (in Hz) of the EMR emitted.

Answer 1

Answer::

Explanation::