Physics Optics Refraction and Reflection

ശൂന്യതയിൽ പ്രകാശത്തിന്റെ വേഗത എത്രയാണ്?

1
330 m/sec
2
3 × 105 m/sec
3
3 × 107 m/sec
4
3 × 108 m/sec
5

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