<span>The current is 6 miles per hour.
Let's create a few equations:
Traveling with the current:
(18 + c)*t = 16
Traveling against the current:
(18 - c)*t = 8
Let's multiply the 2nd equation by 2
(18 - c)*t*2 = 16
Now subtract the 1st equation from the equation we just doubled.
(18 - c)*t*2 = 16
(18 + c)*t = 16
(18 - c)*t*2 - (18 + c)*t = 0
Divide both sides by t
(18 - c)*2 - (18 + c) = 0
Now solve for c
(18 - c)*2 - (18 + c) = 0
36 - 2c - 18 - c = 0
36 - 2c - 18 - c = 0
18 - 3c = 0
18 = 3c
6 = c
So the current is 6 mph.
Let's verify that.
(18 + 6)*t = 16
24*t = 16
t = 16/24 = 2/3
(18 - 6)*t = 8
12*t = 8
t = 8/12 = 2/3
And it's verified.</span>
It is called <em>refraction</em> and is caused the the clear surface bending the light to make it appear different colors or look like it is bent.
12 cm x 2 cm x 3 cm = 72 cm3
Cleats Chicks Bits and Bollards. Hope this helps
Answer:
Explanation:
The distance of a fringe from centre is proportional to wavelength of light
and inversely proportional to separation of slits. The expression for distance x is given by
x = nλ D / d
where λ is wave length , D is screen distance and d is slit separation.
So first option only is correct because
1 ) the wavelength of blue light is less than that of red
2) Intensity of light does not affect distance of fringe from the centre.
3.
Diffraction symbolises bending of light around sharp edges like slits or boundaries of opaque objects etc.Due to this reason , we do not observe sharp boundary of shadow of an object. Instead around the boundary of shadow, we observe bands of bright and dark color which are also called fringes.
The phenomena of diffraction is explained by wave theory of light.
