The refractive index is the ratio of the speed in a vacuum to the speed of light in the given medium. If the refractive index is too low, there will not be a large bending, or deviation, of the light beam from its original path.
The small deviation will make it difficult to carry out the experiment, and is more likely to cause errors. Therefore, larger refractive indexes should be used, in order to ensure that the bending of the light beams is easily traceable.
Answer:
decreases, but frequency increases.
Explanation:
Wavelength and frequency are inversely proportional, meaning the higher the frequency, the shorter the wavelength, and the lower the frequency, the longer the wavelength.
Average speed = total distance / total time
total distance = 40 + 20 = 60km
total time taken = 10 + 5 = 15 minutes
Average speed = 60/15 = 4km/min
Electrical force is the repulsive or attractive force of attraction between any two charged bodies. it is possible to calculate electric force on anything that runs on batteries or uses a plug. Its net effect can be explained using newtons law of motion like any force.
From the coulombs law; F = k (q1║q2)/ r²
Where k = 9 ×10∧9 N.m².C∧-2, r12= 0.285m, q2= +6μC and q1 = 4.86 nC
substituting values in the equation
the net electrical force acting on the +6ц C charge is 5.4 N.
Answer:
494.45 m.
Explanation:
Echo: This is the sound heard after the reflection of sound wave in a plain surface.
v = 2x/t................................ Equation 1
Where v = velocity of sound in air, x = distance between the mountain and the hikers, t = time to hear the echo.
making x the subject of the equation,
x = vt/2........................... Equation 2
Given: v = 341 m/s, t = 2.9 s.
Substitute into equation 2
x = 341(2.9)/2
x = 494.45 m.
Hence the mountain is 494.45 m far away
