of height if a pole of height 45 metre cast the shadow of 25 then what will be the shadow of 27 long pole on the ground at the sam

1 thought on “of height if a pole of height 45 metre cast the shadow of 25 then what will be the shadow of 27 long pole on the ground at the sam”

1. Step-by-step explanation:

   Answer:-

   Time period is 2.16 × 10⁻¹⁵ [Option.B]

   Explanation:-

   We have :-

   → Wavelength of red light = 6500 Å

   = 6.5 × 10⁻⁷ m

   → Velocity of light = 3 × 10⁸ m/s

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   Firstly let’s calculate the frequency of the red light. We know that :-

   ν = c/λ

   ⇒ ν = [3×10⁸]/[6.5×10⁻⁷]

   ⇒ ν = 0.46 × 10¹⁵

   ⇒ ν = 4.6 × 10¹⁴ Hz

   Now :-

   T = 1/ν

   ⇒ T = 1/[4.6 × 10¹⁴]

   ⇒ T = 0.216 × 10⁻¹⁴

   ⇒ T = 2.16 × 10⁻¹⁵ second

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