Answer:
If you are reffering true or false, its true! <3
The doppler effect is when waves’ wavelengths get squished when the source is moving toward you or stretched when the source is moving away from you. it can be observed with sound waves but not light waves because the speed of light is just too fast, meaning that we can’t move toward or away fast enough. (also some stuff with relativity).
Answer:
the sp³ orbital, is a very directional orbital that forms the bonds called covalent. the material is an electrical Insulator. hardness of the material comes from the energy needed to break the covalent bonds (sp³)
Explanation:
Carbon has several structures, for its different ways of bonding, in all these the orbital s is excited and mixed with the orbitals p, creating hybrid orbitals sp³, sp² and sp, there are some π orbitals around the latter.
Each type of hybrid orbital is linked differently, the sp³ orbital, is a very directional orbital that forms the bonds called covalent, where when it binds to another atom they share an electron, therefore the 4 sp³ orbitals form a stable molecule with full orbitals (8 electrons).
As the electrons are in the direction of the links, they cannot be easily moved, so the material is an electrical Insulator.
The hardness of the material comes from the energy needed to break the covalent bonds (sp³), there are only a few directions in which the links can be separated
The correct answer is:
<span>B) orange, yellow, green, blue
the energy of the photons of light is directly proportional to the frequency of the light. This means that the lower the frequency, the lower the energy, and the higher the frequency, the greater the energy.
Therefore, the order in increasing energy is exactly the same as the order in increasing frequency, which is:
</span><span>
orange, yellow, green, blue </span>
Answer:
![0.76m/s^2](https://tex.z-dn.net/?f=0.76m%2Fs%5E2)
Explanation:
We are given that
Final velocity, v=199 km/h=![199\times \frac{5}{18}=55.3m/s](https://tex.z-dn.net/?f=199%5Ctimes%20%5Cfrac%7B5%7D%7B18%7D%3D55.3m%2Fs)
1km/h=![\frac{5}{18}m/s](https://tex.z-dn.net/?f=%5Cfrac%7B5%7D%7B18%7Dm%2Fs)
Initial velocity, u=0
S=2000 m
We know that
![v^2-u^2=2as](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as)
Using the formula
![(55.3)^2=2a(2000)](https://tex.z-dn.net/?f=%2855.3%29%5E2%3D2a%282000%29)
![a=\frac{(55.3)^2}{2\times 2000}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B%2855.3%29%5E2%7D%7B2%5Ctimes%202000%7D)
![a=0.76m/s^2](https://tex.z-dn.net/?f=a%3D0.76m%2Fs%5E2)
Hence, the minimum acceleration necessary for the plane to take flight=![0.76m/s^2](https://tex.z-dn.net/?f=0.76m%2Fs%5E2)