To determine the number of photons emitted per second, we need data on the total power of the system and the total energy of the photons. We determine the power by multiplying the total area to the intensity of the sunlight given. We do as follows:
Power = 0.50 kW / m^2 ( π (0.001^2)) = 1.57x10^-6 kW = 1.57x10^-3 W
The energy of the visible light can be calculated from the expression:
Energy = hc / wavelength
where h is the planck's constant and c is the speed of light
Energy = (6.63 x 10^-34) (3 x 10^8) / 550 x 10^-9
Energy = 3.62 x 10^-19 J
Number of photons per second = 1.57x10^-3 J/s / 3.62 x 10^-19 J
Number of photons per second = 4.34x10^15
Answer:
-18 Nm
Explanation:
Impulse = Change of Momentum
I = ∆p
I = mv2 - mv1
I = 3 x 3 - 3 x 9
I = 9 - 27
I = -18 Nm
<u>Answer:</u>
"They stay in place and vibrate" is true about the particles of iron.
<u>Explanation:</u>
The iron in solid state have tiny particles like atoms, molecules and ions which stay in their position and can only vibrate slightly as their arrangement is compact in nature which do not allow them to move all over the place due to strong force of attraction called as "inter-molecular attraction".
While iron in molten form, being semi-solid have more spaces between the particles, therefore they vibrate more than the particles in compact situation of solid state. And definitely the inter-molecular force of attraction is also weaker than in between actual solid iron particles.
Answer:
independent variables are variables in mathematical modeling, statistical modeling and experimental science