Answer:
n = 2.208x10¹⁸ photons
Explanation:
The energy of a photon( an elementary particle) is given by the equation:
E = nxhxf
Where n is the number of photons, h is plank constant (6,62x10⁻³⁴ J.s), and f is the frequency. Knowing that the power level is 0.120mW (1.2x10⁻⁴ W), the energy in J, for a time of 78 min (4680 s)
E = 1.2x10⁻⁴x4680 = 0.5616 J
The frequency of a photon is its velocity ( c= 3x10⁸ m/s) divided by its wavelength, which is 780 nm = 780x10⁻⁹ m
f = 3x10⁸/780x10⁻⁹
f = 3.846x10¹⁴ s⁻¹
Then, the number of photons is:
0.5616 = nx6,62x10⁻³⁴x3.846x10¹⁴
n = 2.208x10¹⁸ photons.
Tempratures
1. -60 C = 213.15 K
2. 250 C= 523.15 K
3. 365 K = 91.85 C
4. 205 K = -68.15 C
Pressures
1. 22.0 inches Hg = 558.8 mm Hg
2. 3.4 atm = 2584 mm Hg
3. 680 mm Hg = 0.894737 atm
4. 785 mm Hg = 104.658 kPa
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<span>Multiply the coefficient in front of the formula times the subscript for each element. This gives 36 carbon atoms, 72 hydrogen atoms, and 36 oxygen atoms.</span>
Answer: According to research
Lead when reacted with nitric acid forms lead (II) nitrate, nitrogen oxide and water
Explanation: