Benjamin Franklin was a prolific inventor. He invented the lightning rod, the Franklin stove, studied electricity, discovered the Gulf Stream, started the first library, and on and on. Among his many other inventions, what musical instrument did he invent?
Options: two internal refractions before emerging out of the drop, one internal refractions before emerging out of the drop, no internal refraction, either one or two internal refractions before emerging out of the drop
Options: absorption of corresponding wavelengths by the outer layers of the sun, destructive interference between waves of certain definite wavelengths, absorption of corresponding wavelengths by the prism used in the photograph, absence of corresponding wavelengths from the light emitted by the core of the sun
The current price index (base 1960) is nearly 330. This means that
Options: all items cost 3-3 times more than what they did in 1960, the prices of certain selected items have gone up to 3-3 times, weighted means of prices of certain item has increased 3-3 times, gold price has gone up 3-3 times