Blog categorized as Modern Physics

Q- A small ideal mirror of mass 10 mg is suspended by a light thread of length 10 cm. Find the angle through which the thread will be deflected when a short laser pulse of energy 15 J is shot on the mirror horizontally and normally to the surface of the mirror and reflected completely.

Solution:

Q- Isotope 137 Cs of Cesium has a half life of 30 years. Suppose a distributor sells 5 grams of it in January 1, 2000. (a) Write an equation with giving the number of grams of the isotope left "t" years after January 1, 2000. (b) How many grams are present after 6 years?

Solution: