<span>The answer is 62 u. The molecular mass of a molecule (Mr) is the sum of atomic masses (Ar) of its elements. Ar(Na) = 23 u. Ar(O) = 16 u. Therefore, the molecular mass of sodium oxide is 62 u: Mr(Na2O) = 2 * Ar(Na) + Ar(O) = 2 * 23 u + 16 u = 46 + 16 = 62 u.</span>
(18 gallon/tank) x (23 mile/gallon) = <em>414 mile/tank</em>
Answer:
So visible wavelength which is possible here is
416 nm and 693.3 nm
Explanation:
As we know that for normal incidence of light the path difference of the reflected ray is given as

so here we can say that for maximum intensity condition we will have

so we have

now for visible wavelength we have
for N = 1




for N = 2



for N = 3



Answer:
Transmission of telephone signals
Explanation:
Fiber optics are used for the transmission of telephone signals.
Where is the cube I don't see any picture?