Which of the following provides an instantaneous measure of radioactivity: 1 scintillation counter2. geiger counter3. film-badge dosimeterb onlyb and c onlya and b onlya, b, and c

A and B only

Explanation:

Both Scintillation counter and Geiger counter are used  for instantaneous measures of radioactivity.

Both are used to detect and quantify the amount of radiation. GM counter can detect all kind of radiation that alpha, beta and gamma radiation. Whereas  Scintillation counter can detect only ionization radiation.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.