Question

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?

Answer 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