Answer: The time period of the given wave with frequency of 425 Hertz is 0.0023 seconds.
Explanation:
Frequency of the wave = 425 Hertz =


The time period of the given wave with frequency of 425 Hertz is 0.0023 seconds.
(AB) & (CD)
Most machines are fueled by gasoline and electricity
Answer:
A)Explanation:
Let object distance be u.
Image distance v = 1.06 - u
Focal length = 20 cm = .2 m
Applying lens formula
1 / v - 1 / u = 1 / f
1 /( 1.06-u) - 1 / u = 1 / .2
5 u² -3.3u - 1.06 =0
It will have two roots
u₁ = .1636 m, u₂ = .8964 m
B ) Magnification
= u = .1636m , v = .8964m
m = .8964 / .1636 = 5.48
C ) When u = .8964m ,v = .1634m
m = .1634 / .8964
=.182
I think it occurs whenever waves come together so that they are in phase with each other.