Your lab experiments showed that -rays ( is the greek letter gamma) are stopped

Question

Your lab experiments showed that -rays ( is the greek letter gamma) are stopped by a dense material such as lead. The Sun's inner core is on average 10 times denser than lead (though not composed of lead) and the absorbed gamma rays are re-emitted. (Note that the Sun's diameter is 1.4 x 10^6 km).

(b)The Sun's inner core extends from the center out to about 25% of its full radius. About how many times will a -ray be absorbed and re-emitted before it reaches the edge of the core if it travels in a straight line?

Explanation / Answer

The Sun's radius is r = D/2 = 1.4 x 10^6km /2 = 0.7 x 10^6 km

Full core of the Sun absorbs 10 times gammaw ray and emitts 10 times.

When the radius increases by 25% that is new radius is 0.7 x 10^6 km + 0.28 x10^6 km

so new radius r| = 0.98 x 10^6km

so number of gammaw ray absorbition and emission = (10/0.7x10^6 ) (0.98x10^6) = 14

hence, when the inner core expands from the centre out to 25% of its radius then it absorbs and re-emits 14 types of gammaw rays.

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