Which of the following particles has the largest penetrating power? MCQ with Answer and Explanation

Explanation:
Area under v-t graph gives displacement (distance if velocity doesn't change sign). Slope of x-t gives velocity. Slope of v-t gives acceleration. Area a-t gives change in velocity.

Explanation:
β ∝ 1/d. If d' = 2d, β' = β/2. Fringe width decreases with increased slit separation. Memory aid: 'β ∝ 1/d; wider slit separation ⇒ narrower fringes'. Wave optics proportionality frequently tested in competitive exams.

Explanation:
After 3 half-lives, remaining = (1/2)³ = 1/8, so disintegrated = 1 - 1/8 = 7/8. Fraction disintegrated = 7/8. Option A remaining. So B.