Which has a greater kinetic energy, a truck, or a train.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same