What total energy (in kj) is contained in 1.0 mol of photons, all with a frequency of 2.75 × 1014 hz?

Aquantity of that isotope to decay to 1/2 of  its original value

The surface of the water droplet is held together by the attraction between molecules. in order for water to flow more easily into these small spaces, you need to decrease its surface tension. you can do this by adding soap, which is a surfactant (a material that decreases the surface tension of a liquid).

Needs for population

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