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Question

It is found that electromagnetic signals sent inside glass sphere from A towards B reach point C. The speed of electromagnetic signals in glass cannot be:

  1. 1.0 cross times 10 to the power of 8 end exponent text end text m divided by s    
  2. 2.4 cross times 10 to the power of 8 end exponent text end text m divided by s    
  3. 2 cross times 10 to the power of 7 end exponent text end text m divided by s    
  4. 4 cross times 10 to the power of 7 end exponent text end text m divided by s    

The correct answer is: 2.4 cross times 10 to the power of 8 end exponent text end text m divided by s

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