Hospital x-ray generators emit x-rays with wavelength of about 15.0 nanometers (nm), where 1nm=10−9m. what is the energy of a photon of the x-rays? express your answer to three significant figures and include the appropriate units.

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

A4.0-cm tall light bulb is placed a distance of 32.0 cm from a concave mirror having a focal length of 16.0 cm. determine the image distance