The power source such as a Battery of an IED creates an electrical charge.

Light year is a unit of distance.

Brightness of bulb depends on both voltage and current. The brightness depends on power.

Since we know that Power (P) = Voltage x Current = V I

So whether you increase the current or the voltage the brightness will increase.

Lightning is extremely hot — a flash can heat the air around it to temperatures five times hotter than the sun’s surface. This heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.

Lightning heats the surrounding air to about 30,000 degrees Centigrades.

We know that,

The equivalent K = (L1 + L2)/(L1/K1+L2/K2)

where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively.

But here L1 = L2 = L (say)

Then K = L+L/(L/K1 + L/K2) = 2K1K2/(K1+K2)

Curie is the unit of radio activity.

As far as the rate of photosynthesis is concerned, it is fastest in white light making the rate of photosynthesis maximum.

After White, We Have Violet Light Where Photosynthesis Occur To A Higher Extent as It Has The Shortest Wavelength Hence Has The Max Energy.

So The Order Is :: white>violet>blue.

Angle/strain/specific gravity physical quantity is dimensionless.

Newton first law is also called law of inertia.

Distance of stars are measured in Light year.