Hi hope I help, so first 123×20 which = 2,460 then, 2,460×31 and the answer is 76,260
Answer:
152 photons
Step-by-step explanation:
Data provided in the question:
wavelength of the green light, λ = 550 nm = 550 × 10⁻⁹ m
Total energy = 5.50 × 10⁻¹⁷ J
Now,
Energy = ![\frac{nhc}{\lambda}](https://tex.z-dn.net/?f=%5Cfrac%7Bnhc%7D%7B%5Clambda%7D)
here,
n = number of photons
h = Plank's constant = 6.63 × 10⁻³⁴ J.s
c = speed of light = 3 × 10⁸ m/s
Therefore,
5.50 × 10⁻¹⁷ J = ![\frac{n\times(6.63\times10^{-34})\times(3\times10^8)}{550\times10^{-9}}](https://tex.z-dn.net/?f=%5Cfrac%7Bn%5Ctimes%286.63%5Ctimes10%5E%7B-34%7D%29%5Ctimes%283%5Ctimes10%5E8%29%7D%7B550%5Ctimes10%5E%7B-9%7D%7D)
or
( 5.50 × 10⁻¹⁷)( 550 × 10⁻⁹) = n(6.63 × 10⁻³⁴)(3 × 10⁸)
or
3025 × 10⁻²⁶ = n(19.89 × 10⁻²⁶ )
or
n = 152.086 ≈ 152 photons
Answer:
15/v
Step-by-step explanation:
Spped, v is the distance moved per unit time hence expressed as
V=d/t
Normally, speed is given in miles per hour, km per hour, m/s etc hence the unit of time also varies.
Making t the subject of formula then t=d/v
Given d to be 15 miles then t=15/v
This is the the function of the average speed
If the recipe is for one pie, 4 and 1/2 tablespoons of butter is needed.