Puzzle Patel was out looking for a new apartment to rent. The landlord asks him if he has any pets.
Patel: “Three cats”
Landlord: “How old are they?”
Patel: “The product of their ages is 72.”
Landlord: “What kind of answer is that!? I need more information.”
Patel: “Sorry, that must have been unclear. The sum of the ages of my pets is the same as your house number.”
Landlord: “Still not enough information, As we have only 20 houses in this society.”
Patel: “My oldest cat is called Gypsy and sum of letters and her age is related as perfect square”
Landlord: “Okay, cool. Now that I know their ages, you can have the house.”
What is the sum of the ages of Puzzle Patel’s pets?
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