Refraction occurs when a wave changes its A) color. B) frequency. C) intensity. D) speed.
2 answers:
Explanation :
Light shows many different types of phenomena like the reflection of light, refraction of light etc.
Refraction of light is the phenomena of bending of light when it passes from one medium to another. This is due to the difference in the refractive indices of two media.
Refractive index is given by :
c is the speed of light in vacuum
v is the speed of the light in a medium.
So, refraction occurs when a wave changes its speed.
Hence, the correct option is (D) "speed".
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Answer:
The angular speed of the object is 0.0281 rad/s
The linear speed of the object is 0.169 ft/s
Explanation:
Given;
radius of the circle, r = 6 ft
time of motion of the object around the circle, t = 80 s
central angle formed by the object during the motion, θ = 9/4 rad = 2.25 rad
The angular speed of the object is calculated as;
The linear speed of the object is calculated as;
v = ωr
v = 0.0281 rad/s x 6ft
v = 0.169 ft/s