You heat a piece of metal in a furnace starting from room temperature. What is the sequence of colors that the metal will emit as it heats up?
Question 1 options:
IR, then red, then yellow 

blue, then red, then yellow 

UV, then blue, then red 
Question 2 (1 point)
Monochromatic light is normally incident on a diffraction grating that is 2 cm wide and has 20,000 slits. The first order line is deviated at a 30° angle. What is the wavelength, in nm, of the incident light?
Question 2 options:
400 

600 

500 

700 

300 
There are multiple questions posted , so i am answering only the first question:
According to wein's law, _{max}*T=constant, where _{max} is the most probable wavelength in the electromagnetic radiation, and T is temperature.
So,as heating takes place, temperature T increases, and most probable wavelength of the radiation will decrease. So, that option is the correct choice which has wavelengths in decreasing order.
Only the first option ,i.e., IR, then red,then yellow contains wavelengths in decreasing order and no other option has wavelengths in decreasing order.
So, first option is correct.
You heat a piece of metal in a furnace starting from room temperature. What is the...
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