A particle is created in the upper atmosphere; 18km above the surfaceof the Earth as measured by someone on the ground. The particle travelstowards Earth’s surface at a speed of 0.95c as measured by someone on theground. The particle travels for a time period 2.0 × 10−5s as measured inthe particle’s rest frame.The question is attached as an image and the correct answer is A, could someone please explain why this is 40. Does the particle reach Earth's surface?(a) Yes as measured in the particle's frame, and yes as measured inthe Earth's frame.(b) Yes as measured in the particle's frame, and no as measured inthe Earth's frame.(c) No as measured in the particle's frame, and yes as measured inthe Earth's frame.(d) No as measured in the particle's frame, and no as measured inthe Earth's frame.(e) This cannot be determined in either frame.

Answered: Image /qna-images/answer/ae520394-8714-4182-b9b9-223bf9f1a057.jpg

A particle is created in the upper atmosphere; 18km above the surface of the Earth as measured by someone on the ground. The particle travels towards Earth’s surface at a speed of 0.95c as measured by someone on the ground. The particle travels for a time period 2.0 × 10−5s as measured in the particle’s rest frame.

A particle is created in the upper atmosphere; 18km above the surface of the Earth as measured by someone on the ground. The particle travels towards Earth’s surface at a speed of 0.95c as measured by someone on the ground. The particle travels for a time period 2.0 × 10−5s as measured in the particle’s rest frame.

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