Answer:
C.
Explanation:
If there are the same number of protons (+) as electrons (-) they will cancel out and make the atom neutral.
Answer:
Person B
Explanation:
Person B will hear the frequency that is lower than the B- flat.
Answer:
6.02×10²³
Explanation:
Mole measures the number of particles in a specific substance. The numeric value of a mole for atom or molecules is approximately 6.02×10²³ atoms or molecules.
Answer:
The length of the stick is 0.28 m.
The time the stick take to move is 0.97 ns.
Explanation:
Given that,
Relative speed of stick v= 0.96 c
Speed of light ![c= 2.99793\times10^{8}\ m/s](https://tex.z-dn.net/?f=c%3D%202.99793%5Ctimes10%5E%7B8%7D%5C%20m%2Fs)
Proper length of stick = 1 m
We need to calculate the length of the stick
Using formula of length
![\Delta l=\Delta l_{0}\sqrt{(1-\dfrac{v^2}{c^2})}](https://tex.z-dn.net/?f=%5CDelta%20l%3D%5CDelta%20l_%7B0%7D%5Csqrt%7B%281-%5Cdfrac%7Bv%5E2%7D%7Bc%5E2%7D%29%7D)
Put the value into the formula
![\Delta l=1\sqrt{1-\dfrac{(0.96)^2c^2}{c^2}}](https://tex.z-dn.net/?f=%5CDelta%20l%3D1%5Csqrt%7B1-%5Cdfrac%7B%280.96%29%5E2c%5E2%7D%7Bc%5E2%7D%7D)
![\Delta l=1\sqrt{1-(0.96)^2}](https://tex.z-dn.net/?f=%5CDelta%20l%3D1%5Csqrt%7B1-%280.96%29%5E2%7D)
![\Delta l=0.28\ m](https://tex.z-dn.net/?f=%5CDelta%20l%3D0.28%5C%20m)
We need to calculate the time the stick take to move
Using formula of time
![t=\dfrac{\Delta l}{v}](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7B%5CDelta%20l%7D%7Bv%7D)
Put the value into the formula
![t=\dfrac{0.28}{0.96\times(2.99793\times10^{8})}](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7B0.28%7D%7B0.96%5Ctimes%282.99793%5Ctimes10%5E%7B8%7D%29%7D)
![t=9.72\times10^{-10}\ sec](https://tex.z-dn.net/?f=t%3D9.72%5Ctimes10%5E%7B-10%7D%5C%20sec)
![t=0.97\ ns](https://tex.z-dn.net/?f=t%3D0.97%5C%20ns)
Hence, The length of the stick is 0.28 m.
The time the stick take to move is 0.97 ns.