ശൂന്യതയിൽ പ്രകാശത്തിന്റെ വേഗത എത്ര ?
A$$3 x 10^5$ km/s$
B$$225 x 10^5$ km/s$
C$$18 x 10^1$ km/s$
D
A$$3 x 10^5$ km/s$
B$$225 x 10^5$ km/s$
C$$18 x 10^1$ km/s$
D
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