Answer:
a North and South Pole :)
Explanation:
The roughness of the surface should be varied by the students tp test the hypothesis in the best possible way.
Explanation:
As the hypothesis stated the relation between roughness of the surface and the distance covered by the marble, students first need to find the independent variable among these two. The independent variable will be the one which will not depend on the result of the other variable. But there will be change in the dependent variable on changing the independent variable.
So here the independent variable is the roughness of the surface as per the hypothesis. And the dependent variable will be distance covered by the marble.
So the students should vary the independent variable and check for desired changes in the dependent variable for confirmation of hypothesis.
Thus, the roughness of the surface should be varied by the students tp test the hypothesis in the best possible way.
The period of the transverse wave from what we have here is 0.5
<h3>How to find the period of the transverse wave</h3>
The period of a wave can be defined as the time that it would take for the wave to complete one complete vibrational cycle.
The formula with which to get the period is
w = 4π
where w = 4 x 22/7
2π/T = 4π
6.2857/T = 12.57
From here we would have to cross multiply
6.2857 = 12.57T
divide through by 12.57
6.2857/12.57 = T
0.500 = T
Hence we can conclude that the value of T that can determine the period based on the question is 0.500.
Read more on transverse wave here
brainly.com/question/2516098
#SPJ4
Answer:
Wavelength is calculated as 213.9 nm
Solution:
As per the question:
Wavelength of light = 570 nm
Time, t = 16.5 ns
Thickness of glass slab, d = 0.865 ns
Time taken to travel from laser to the photocell, t' = 21.3
Speed of light in vacuum, c = ![3\times 10^{8}\ m/s](https://tex.z-dn.net/?f=3%5Ctimes%2010%5E%7B8%7D%5C%20m%2Fs)
Now,
To calculate the wavelength of light inside the glass:
After the insertion of the glass slab into the beam, the extra time taken by light to cover a thickness t = 0.865 m is:
t' - t = 21.3 - 16.5 = 4.8 ns
Thus
![\frac{d}{\frac{c}{n}} - \frac{d}{v} = 4.8\times 10^{- 9}](https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7B%5Cfrac%7Bc%7D%7Bn%7D%7D%20-%20%5Cfrac%7Bd%7D%7Bv%7D%20%3D%204.8%5Ctimes%2010%5E%7B-%209%7D)
![\frac{0.8656}{\frac{c}{n}} - \frac{0.865}{v} = 4.8\times 10^{- 9}](https://tex.z-dn.net/?f=%5Cfrac%7B0.8656%7D%7B%5Cfrac%7Bc%7D%7Bn%7D%7D%20-%20%5Cfrac%7B0.865%7D%7Bv%7D%20%3D%204.8%5Ctimes%2010%5E%7B-%209%7D)
where
n = refractive index of the medium
v = speed of light in medium
![\frac{0.8656}{\frac{c}{n}} - \frac{0.865}{v} = 4.8\times 10^{- 9}](https://tex.z-dn.net/?f=%5Cfrac%7B0.8656%7D%7B%5Cfrac%7Bc%7D%7Bn%7D%7D%20-%20%5Cfrac%7B0.865%7D%7Bv%7D%20%3D%204.8%5Ctimes%2010%5E%7B-%209%7D)
![n = \frac{4.8\times 10^{- 9}\times 3.00\times 10^{8}}{0.865} + 1](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7B4.8%5Ctimes%2010%5E%7B-%209%7D%5Ctimes%203.00%5Ctimes%2010%5E%7B8%7D%7D%7B0.865%7D%20%2B%201)
n = 2.66
Now,
The wavelength in the glass:
![\lambda' = \frac{\lambda }{n}](https://tex.z-dn.net/?f=%5Clambda%27%20%3D%20%5Cfrac%7B%5Clambda%20%7D%7Bn%7D)
![\lambda' = \frac{570}{2.66} = 213.9\ nm](https://tex.z-dn.net/?f=%5Clambda%27%20%3D%20%5Cfrac%7B570%7D%7B2.66%7D%20%3D%20213.9%5C%20nm)
The answer is A.
It will decay to give you Thorium and Helium.
Please give me Brainliest.