Answer:
<em>2035 </em>
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Explanation:
The doctor does not travel with the woman, and therefore, he won't experience any relativistic effect on his time. The doctor will judge time by the time here on earth. Technically, the last new year's day the doctor, who is here on earth, would expect the woman to celebrate will be in 2020 + 15 years = <em>2035 </em>
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Answer:
Only two diffraction orders +1 and -1 are possible
Explanation:
The diffraction net is a system with many uniformly spaced lines, which is described by the expression
d sin θ = m λ m = 1, 2, 3,…
Where d is the spread between the lines, λ the wavelength and m is an integer that corresponds to the order of diffraction, all wavelengths
For this case the spacing is
d = 775 nm
The sodium emission lines are 589.00 nm and 589.59 nm
With this data we can calculate how many diffraction orders are visible
θ = sin⁻¹ (m λ / d)
m = 1
λ1 = 589.00 nm
θ1 = sin⁻¹ (1 589/775)
θ1 = 49.46 °
λ2 = 589.59 nm
θ2 = sin⁻¹ ((1 589.59 / 775)
θ2 = 49.53 °
m = 2
λ1 = 589.00 nm
θ1 = sin⁻¹ (2 589/775)
θ1 = sin⁻¹ (1.5)
This order is not possible because the sin cannot be greater than 1
m = -1
λ1 = 589 nm
θ1 = sin⁻¹ (-1 589/775)
θ1 = -49.46
θ= sin⁻¹ ( -1 589.59/775)
λ2 = 589.59 nm
θ2 = -49.53 °
m = -2
λ1 = 589 nm
θ1 = sin-1 (-2 589/775)
This order does not occur because the breast cannot be greater than 1
Only two diffraction orders +1 and -1 are possible
Too much smoke and debris around the house?
