The number of electrons is
Explanation:
The total net charge on a negatively-charged object is given by
where:
N is the number of excess electrons
is the charge of a single electron
In this problem, we have
is the overall charge of the object
is the charge of one electron
Solving the equation for N, we find:
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Answer:
t ’= , v_r = 1 m/s t ’= 547.19 s
Explanation:
This is a relative velocity exercise in a dimesion, since the river and the boat are going in the same direction.
By the time the boat goes up the river
v_b - v_r = d / t
By the time the boat goes down the river
v_b + v_r = d '/ t'
let's subtract the equations
2 v_r = d ’/ t’ - d / t
d ’/ t’ = 2v_r + d / t
In the exercise they tell us
d = 1.22 +1.45 = 2.67 km= 2.67 10³ m
d ’= 1.45 km= 1.45 1.³ m
at time t = 69.1 min (60 s / 1min) = 4146 s
the speed of river is v_r
t ’=
t ’=
In order to complete the calculation, we must assume a river speed
v_r = 1 m / s
let's calculate
t ’=
t ’= 547.19 s
To solve this problem it is necessary to express the term of the wavelength of continuous x-rays according to the Planck constant, the speed of light, the charge of the electron and the voltage. This definition is expressed mathematically as
Here,
h is Planck's constant
c is speed of light
e is charge of electron
V is the potential to which the electrons are accelerated.
From this definition we can see that the wavelength is independent of the mass of the target material. Therefore the wavelength will remain the same.