499.15 is lines per millimeter needed in a diffraction grating if the lines are to be resolved in the second-order spectrum with a beam of width 0.10 mm.
the wave length of the sodium spectrum are λ1 = 589.0 nm and λ2 =589.59 nm
The resolving power of the grating is R = λ/Δλ =Nm.
Thus, the total number of lines needed on the grating to resolve the wavelengths in order m is
For the sodium doublet in the first order, N = λ /m(Δλ)
where λ = 589.0 nm , Δλ = 589.59 nm -589.0 nm = 0.59 nm
m = 2
The minimum number of lines in the grating
N = [589.0 nm] / [(2)( 0.59 nm )] = 499.15
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Answer:
option B. Limestone
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It is overhead at the equator, it is because the sun ray’s
will be moving vertically as this will be directed at the equator. It is
because if it moves vertically, it will hit or overhead the equator and this
usually happens in spring and fall.
the answer is B
the size shape or state of matter changes
because if the shape and size are changing it’s still the same thing.
for example
water to ice