It is advisable to wear long sleeve when when a student is working in a chemistry lab so that to protect arms from lab chemicals. when someone enter the chemistry lab to wort or to study should be well prepared with appropriate gears and security measure to avoid injury.
Answer:
is the energy of one photon of this radiation.
Explanation:
where,
E = energy of photon
h = Planck's constant =
c = speed of light =
= Frequency of the radiation
= wavelength of the radiation":
We have :
Energy of the photon of the radiation :
is the energy of one photon of this radiation.
The density of water at 20 °C is 0.9982 g/cm^{3} or 998.2 g/L. The volume of water is 0.127 L thus, its mass can be calculated from the following formula:
d=\frac{m}{V}
Here, d is density, m is mass and V is volume of water.
On rearranging,
m=d×V=(998.2 g/L)(0.127 L)=126.7 g
Thus, mass of water is 126.7 g.