Answer:
-3,89
Explanation:
First to consider is that the reaction is raising the temperature of the solution, so it's an exothermic reaction.
The enthalpy can be calculated by the following equation:
First we need to calculate the mass using the density and the volume:
⇒
Then we have Cp = 3,74 Joules/gram°K ΔT = -3,33 °C (cause of exothermic reaction)
Replacing in the formula:
Answer:
Check the explanation
Explanation:
(a) When the electric field is applied to the ends of the wire, electrons move through the wire because the resistance of the wire is less than the resistance of the surrounding air. Resistance is the obstruction to the flow of electrons hence electrons flow through the path having minimum resistance.
(b) As the thermal energy increases, Kinetic energy of electrons as well as that of positive ions also increase. Hence the mean time between collisions of electrons with ions is reduced due to movement of ions also. That is why Resistance of the wire increases.
B as distance from the source increases, intensity stays the same
Answer:
NO
Explanation:
The angular position of a diffraction null is given by
Asinθ=m λ=m c/f
Given that A is the slit width,
and m is an integer.
The wavelength of the second null satisfies
λ= A sinθ₁/2
of which if there were distinct third null it will satisfy
sinθ₂=3λ/A= 3* sin 45/2
λ=(3*0.7071)/2
λ=2.121/2
λ=1.060
Of which 1.060 is greater than 1