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31.07.2019 •
Physics
How are double rainbows formed and why the colours are inverted in a double rainbow?
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Ответ:
These refraction and reflection process described above creates a primary and secondary rainbow. The first and brighter is called the primary rainbow. The second and more faint rainbow is the secondary rainbow, it occurs when the refracted light does not escaped the raindrop after being reflected the first time. Instead, the refracted light reflects off the raindrop's surface a second time, producing a secondary rainbow with its color reversed compared to the primary rainbow. There are only fewer light ray available to undergo the additional refraction process, so the resulting secondary rainbow appears less vivid.
Ответ:
(a) 0.204 Weber
(b) 0.22 Volt
Explanation:
N = 100, radius, r = 10 cm = 0.1 m, B = 0.0650 T, angle is 90 degree with the plane of coil, so theta = 0 degree with the normal of coil.
(a) Magnetic flux, Ф = N x B x A
Ф = 100 x 0.0650 x 3.14 x 0.1 0.1
Ф = 0.204 Weber
(b) B1 = 0.0650 T, B2 = 0.1 T, dt = 0.5 s
dB / dt = (B2 - B1) / dt = (0.1 - 0.0650) / 0.5 = 0.07 T / s
induced emf, e = N dФ/dt
e = N x A x dB/dt
e = 100 x 3.14 x 0.1 x 0.1 x 0.07 = 0.22 V