Answer:
The angle of refraction is option b: 17°.
Explanation:
We can find the angle of refraction by using Snell's law:
![n_{1}sin(\theta_{1}) = n_{2}sin(\theta_{2})](https://tex.z-dn.net/?f=%20n_%7B1%7Dsin%28%5Ctheta_%7B1%7D%29%20%3D%20n_%7B2%7Dsin%28%5Ctheta_%7B2%7D%29%20)
Where:
n₁: is the index of refraction of the medium 1 (air) = 1.0003
n₂: is the index of refraction of the medium 2 (diamond) = 2.42
θ₁: is the angle of incidence = 45°
θ₂: is the angle of refraction =?
Hence, the angle of refraction is:
![sin(\theta_{2}) = \frac{n_{1}sin(\theta_{1})}{n_{2}} = \frac{1.0003*sin(45)}{2.42} = 0.2922](https://tex.z-dn.net/?f=%20sin%28%5Ctheta_%7B2%7D%29%20%3D%20%5Cfrac%7Bn_%7B1%7Dsin%28%5Ctheta_%7B1%7D%29%7D%7Bn_%7B2%7D%7D%20%3D%20%5Cfrac%7B1.0003%2Asin%2845%29%7D%7B2.42%7D%20%3D%200.2922%20)
![\theta_{2} = 17 ^{\circ}](https://tex.z-dn.net/?f=%20%5Ctheta_%7B2%7D%20%3D%2017%20%5E%7B%5Ccirc%7D%20)
Therefore, the correct option is b: 17°.
I hope it helps you!
Answer:
Explanation:
<u>Definition:</u> Noise pollution is generally defined as regular exposure to elevated sound levels that may lead to adverse effects in humans or other living organisms.
<u>Measures to be taken:</u>
- international bodies like the WHO agree that awareness of noise pollution is essential to beat this invisible enemy. For example: avoid very noisy leisure activities, opt for alternatives means of transport such as bicycles or electric vehicles over taking the car, do your housework at recommended times, insulate homes with noise-absorbing materials, etc. Educating the younger generation is also an essential aspect of environmental education.
- Governments can also take measures to ensure correct noise management .
- Close the Windows.
- Put on Earplugs. …
- Improve your Insulation. …
- Invest in Noise-Canceling Headphones. …
- Do Wall-to-Wall Carpeting. …
- Install a Fence. …
- Be Creative with the Office or House Layout. …
- Invest in Noise-Friendly Flooring..
Answer:
A galaxy with a disk and central bulge like a spiral galaxy, but with no spiral arms
Explanation:
A Lenticular galaxy is a kind of galaxy intermediate between elliptical galaxy and a spiral galaxy in the Morphological classification system of galaxies. They have a central bulge or disc just like a Spiral galaxy but lacks the arms of spiral galaxy. If looked edge on they appear to be spiral and if looked face on they appear to be elliptical.
The absence of spiral arms can be attributed to the absence of star formation. They mainly consists of ageing stars.
I = mΔv
I = 2.5 x (7.5 - 0) = 18.75 kg.m/s
Now, considering that the ball´s initial velocity was zero, we have:
1.45 x 0 + 2.5 x 7.5 = 1.45 x V
1.45V = 18.75
V = 12.93 m/s