Answer:
Answer is B.
Because the wavelength of infrared is shorter than microwave radiation
Answer:
i)20369 photons
ii) 40 ps
Explanation:
Momentum of one Sodium atom:
![P=m*v =600m/s*23amu*\frac{1 kg}{6.02*10^{23}amu}\\P=2.29*10^{-23}kgm/s](https://tex.z-dn.net/?f=P%3Dm%2Av%20%3D600m%2Fs%2A23amu%2A%5Cfrac%7B1%20kg%7D%7B6.02%2A10%5E%7B23%7Damu%7D%5C%5CP%3D2.29%2A10%5E%7B-23%7Dkgm%2Fs)
In other to stop it, it must absorb the same momentum in photons:
![P=2.29*10^{-23}kgm/s=n_{photons}*\frac{h_{planck}}{\lambda}\\=n*\frac{6.63*10^{-34}}{589*10^{-9}} \\==>n=20369 photons](https://tex.z-dn.net/?f=P%3D2.29%2A10%5E%7B-23%7Dkgm%2Fs%3Dn_%7Bphotons%7D%2A%5Cfrac%7Bh_%7Bplanck%7D%7D%7B%5Clambda%7D%5C%5C%3Dn%2A%5Cfrac%7B6.63%2A10%5E%7B-34%7D%7D%7B589%2A10%5E%7B-9%7D%7D%20%5C%5C%3D%3D%3En%3D20369%20photons)
Now, for the minimun time, we use the speed of light and the wavelength. For the n photons:
![t=n*T=n*\frac{\lambda}{c} =20369*\frac{589nm}{3*10^{8}m/s}=4*10^{-11} second=40 ps](https://tex.z-dn.net/?f=t%3Dn%2AT%3Dn%2A%5Cfrac%7B%5Clambda%7D%7Bc%7D%20%3D20369%2A%5Cfrac%7B589nm%7D%7B3%2A10%5E%7B8%7Dm%2Fs%7D%3D4%2A10%5E%7B-11%7D%20second%3D40%20ps)
Answer:
Measurement is the assignment of a number to a characteristic of an object or event
Explanation:
Answer: Because When two objects, such as your hair and the balloon rub together, one loses some of its electrons to the other. This makes one object positively charged and the other object negatively charged. This movement of the electrons causes the neutral object to get a low positive charge.