वायु में प्रकाश की चाल कितनी होती है?
Asked in – RRB JE Previous Paper 6 (Held On: 24 May 2019 Shift 1)
- 3 × 106 m/s
- 3 × 108 m/s
- 3 × 104 m/s
- 3 × 105 m/s
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Asked in – RRB JE Previous Paper 6 (Held On: 24 May 2019 Shift 1)