Answer:
Transition has to cross between solid and liquid in gray zone.No indoor organized public events and social gatherings are allowed, except with members of the same household.
Answer:
Explanation:
6 waves in 12 seconds
The period of a wave is defined as the time taken by the wave to complete one oscillations.
Here, 6 waves are completed in 12 seconds
So, one wave is completed in 2 seconds
So, the period of the wave is 2 second.
frequency is defined as the number of waves completed in one second. It is the reciprocal of period of the wave.
frequency = 1 / 2 = 0.5 Hertz
Let the wavelength is λ.
f = 660 kHz = 660000 Hz
the relation for the wave speed and the wavelength and the frequency is given by
v = f λ
where v is the speed of wave = 3 x 10^8 m/s
So, 3 x 10^8 = 660000 x λ
λ = 454.55 m
<span>about 1/10 of the time spent burning hydrogen</span>
Answer:
C) By exposing a coil of wire to a changing magnetic field
Explanation:
An electrical generator creates electricity by exposing a coil of wire to changing magnetic field.
The generator converts mechanical energy which the energy due to the motion of a body and this produces electrical currents.
- In the presence of a magnetic field electric current is induced within the circuit.
- The mechanical energy is obtained from an external source and sustained by the turning of the pistons with the set up.
- This keeps the generator in constant motion and through the magnetic fields.
Answer:
Part a)
Part b)
here we know that L = length of the wire
Explanation:
Part a)
Current density is given as
since current is uniformly divided across the crossection of the wire so it is given as
Part b)
As we know that volume current density is inversely proportional to the distance from the axis
So we will have
so we have
here we know that L = length of the wire