railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Wave

हवेतील प्रकाशाचा वेग किती आहे?

1

3 × 10⁶ मी/से

2

3 × 10⁸ मी/से

3

3 × 10⁴ मी/से

4

3 × 10⁵ मी/से

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