29. x is directly proportional to 4 more than the square of
yox is 39 when y is 3. What is the positive value of y
when x is 60? answer explain
Answers
Answered by
0
Answer:
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
________________________________
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
Answered by
1
Answer:
4
Step-by-step explanation:
Given,
x ∝ 4+y²
x=k(4+y²)
if x=39 then y =3 so we get the value of k
39=k(4+9)
k=3
Now, we have to find the y if x=60
so
x=k(4+y²)
60=3(4+y²)
20=4+y²
y=4
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