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 same timem
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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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