1.23x10^2
So there should be one number to the left at all times, even a zero when it comes to decimals and negative scientific numbers. Also 10 is raised to the power by how many you need to move the decimal for the original number.
Answer : The height of the column in a barometer is, 10.3 m
Explanation :
To calculate the height of the column in a barometer we are using formula as:
![P=h\rho g](https://tex.z-dn.net/?f=P%3Dh%5Crho%20g)
where,
P = external pressure = ![101kPa=101\times 10^3kg/m.s^2](https://tex.z-dn.net/?f=101kPa%3D101%5Ctimes%2010%5E3kg%2Fm.s%5E2)
Conversion used : ![1kPa=10^3kg/m.s^2](https://tex.z-dn.net/?f=1kPa%3D10%5E3kg%2Fm.s%5E2)
h = height of the column in a barometer = ?
= density of water = ![1.00g/cm^3=1000kg/m^3](https://tex.z-dn.net/?f=1.00g%2Fcm%5E3%3D1000kg%2Fm%5E3)
Conversion used : ![1g/cm^3=1000kg/m^3](https://tex.z-dn.net/?f=1g%2Fcm%5E3%3D1000kg%2Fm%5E3)
g = constant of gravity = ![9.81m/s^2](https://tex.z-dn.net/?f=9.81m%2Fs%5E2)
Now put all the given values in the above formula, we get:
![101\times 10^3kg/m.s^2=h\times 1000kg/m^3\times 9.81m/s^2](https://tex.z-dn.net/?f=101%5Ctimes%2010%5E3kg%2Fm.s%5E2%3Dh%5Ctimes%201000kg%2Fm%5E3%5Ctimes%209.81m%2Fs%5E2)
![h=10.3m](https://tex.z-dn.net/?f=h%3D10.3m)
Therefore, the height of the column in a barometer is, 10.3 m
Answer:
C
Explanation:
It's not A because you can't use a knife to cut an atom nucleus. Its size is not perceptible to the eye.
It's not B because when two nuclei collide and combine into one, it's call fusion.
It's not D because you can't have stronger forces than the ones holding the nucleus together.
The correct answer is C.
To fission, the nucleus needs to have at least two things: critical mass (only big ones can fission spontaneously) and instability (incorporate a neutron ).
PV = constant
V doubles, P will become half
New pressure = 100/2 = 50 torr