Geography · Seismic Waves
What happens to the velocity of Primary (P) waves when they enter the liquid outer core from the lower mantle?
- 1It drops to zero
- 2It remains completely unchanged
- 3It decreases significantly✓
- 4It increases abruptly
Correct answer
It decreases significantly
Explanation
स्पष्टीकरण:
प्राथमिक तरंगें (P-waves): ये अनुदैर्ध्य (longitudinal) तरंगें होती हैं जो ठोस, द्रव और गैस तीनों माध्यमों से गुजर सकती हैं।
वेग में परिवर्तन: जब ये ठोस निचले मैंटल से तरल बाहरी कोर (Outer Core) में प्रवेश करती हैं, तो माध्यम के घनत्व और प्रत्यास्थता (elasticity) में अचानक बदलाव के कारण इनके वेग (velocity) में भारी गिरावट आती है, यानी यह काफी कम हो जाता है।
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