A photon is emitted, when an electron makes a transition from a higher energy level to a lower energy level. If the energy of the higher energy level is - 2.689 x 10-20 J and the energy level of the lover energy level is -5.445 x 10-19 J, what is the wavelength of the emitted photon (in nm)?

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?