Maths-
General
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Question

Ifblank f blank open square brackets x close square bracketsdenotes the greatestinterger not exceeding x and if the function f defined byblank f open parentheses x close parentheses equals open curly brackets table row cell fraction numerator a plus 2 blank c o s blank x over denominator x to the power of 2 end exponent end fraction blank left parenthesis x less than 0 right parenthesis end cell row cell b blank t a n fraction numerator pi over denominator left square bracket x plus 4 right square bracket end fraction text end text text ( end text text x end text greater or equal than 0 text ) end text text end text end cell end table close text  is continuous at  end text x equals 0 text  then end text the order pair (a,b)=

  1. (-2, 1)    
  2. (-2, -1)    
  3. (-1, square root of 3)    
  4. (-2, square root of 3)    

The correct answer is: (-2, -1)

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B) In gas filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation.

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II)
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II)
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