Answer:
E = 2,575 eV
Explanation:
For this exercise we will use the Planck equation and the relationship of the speed of light with the frequency and wavelength
E = h f
c = λ f
Where the Planck constant has a value of 6.63 10⁻³⁴ J s
Let's replace
E = h c / λ
Let's calculate for wavelengths
λ = 4.83 10-7 m (blue)
E = 6.63 10⁻³⁴ 3 10⁸ / 4.83 10⁻⁷
E = 4.12 10-19 J
The transformation from J to eV is 1 eV = 1.6 10⁻¹⁹ J
E = 4.12 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)
E = 2,575 eV
Answer:
75 m /s
Explanation:
Acceleration of ball a = change in velocity / time
=( 90 - 60)/ 3 = 10 m s⁻²
Initial velocity u = 60 m/s
a = 10 m s⁻²
time t = 3
distance traveled s = ut + 1/2 at²
= 60 x 3 + .5 x 10 x 3 x 3
= 225 m
Average velocity = total distance traveled /time
= 225 / 3 = 75 m/s
Answer:
177 coulomb
Explanation:
Given data
I=2.95A
T=60
The relationship between current I and quantity of charge Q.
Q=IT
Substitute
Q=2.95*60
Q=177 coulomb