The two different sources are primary and secondary sources
Irregular Sources and Regular Sources
The two types of thermal energy sources are Geothermal and Thermal Energy
two coherent light sources are produced by splitting a single light source
You have to correct the question as,Why are two independent sources of light not used to illuminate the two slits in Young's double slit experiment?We need coherent sources. But two independent sources would emit waves with varying phase difference which makes waves non coherent.
The two different sources are primary and secondary sources
Irregular Sources and Regular Sources
e
primary sources and secondary sources.
Excellent sources of vitamin E include spinach, turnip greens, and chard. Very good sources of vitamin E include mustard greens, cayenne pepper, sunflower seeds, almonds, bell peppers, and asparagus. Good sources of vitamin E include collards, kale, watercress, tomatoes, cranberries, broccoli, Brussels sprouts, papaya, raspberries, and carrots.
The two main sources in water vapor are farming and manufacturing
there are not just two electrical sources of energy there are lots but two could be solar and biomass
The two types of thermal energy sources are Geothermal and Thermal Energy
The two sources of white light are: *visible light *The Sun.
Thomas E. Weisskopf has written: 'Sources of American imperialism'
High powered electrical wiring and florescent lights.
Besides nuclear DNA two other sources of DNA are mitochondria and chloroplasts. Cytoplasmic inheritance is influenced by the DNA from these two sources.