It is the first one. But if you have this question you are not a little boy
Answer:
ultraviolet light shining on the minerals will cause them to give off visible light.
Explanation:
Here we know that in all electromagnetic waves have certain range of energy
Here in the above case when a given frequency range of electromagnetic wave incident on the fluorescent mineral then that mineral will absorb few amount of energy and the remaining energy will throw back into the surrounding again.
So here the main concept is that when a electromagnetic wave which is higher in energy then visible light incident on fluorescent material then it will absorb some amount of energy and the remaining energy is released in form of light
So here energy more than visible light is for ultraviolet light only
so here the correct answer would be
ultraviolet light shining on the minerals will cause them to give off visible light.
Answer:
R = 0.1 ohms
Explanation:
It is given that,
Voltage of the battery, V = 12.5 V
Current flowing in the car's starter, I = 125 A
We need to find the effective resistance of a car's starter. It can be calculated using Ohm's law. Let R is the resistance.
So, the resistance of the car's starter is 0.1 ohms.
Answer:
Force = mass × acceleration
Acceleration:
From first Newton's equation of motion:
Change = v - u:
Answer:
Number of turns of wire(N) = 3,036 turns (Approx)
Explanation:
Given:
Diameter = 13 Cm
emf = 5.6 v
Note:
The given question is incomplete, unknown information is as follow.
Magnetic field increases = 0.25 T in 1.8 (Second)
Find:
Number of turns of wire(N)
Computation:
radius (r) = 13 / 2 = 6.5 cm = 0.065 m
Area = πr²
Area = (22/7)(0.065)(0.065)
Area = 0.013278 m²
So,
emf = (N)(A)(dB / dt)
5.6 = (N)(0.013278)(0.25 / 1.8)
5.6 = (N)(0.013278)(0.1389)
N = 3,036.35899
Number of turns of wire(N) = 3,036 turns (Approx)
