Asodium atom will absorb light with a wavelength near 589 nm if the light is within 10 mhz of the resonant frequency. the atomic mass of sodium is 23. (i) calculate the number of "yellow" photons of wavelength 2 = 589 nm that must be absorbed to stop a sodium atom initially at room temperature (v-600 m/s). [7 marks] (ii) what is the minimum time needed to cool a sodium atom?

4. 50x10= 500m/s 5. 52m/s

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

Iagree c would be the answer

It equals just about 6,300 km per hour each day an week