3. Uma lâmpada foi ligada diretamente a uma pilha. Mediu-se a diferença de potencial nos extremos da pilha tendo-se obtido o valor 4,0 V. A intensidade de corrente na lâmpada é 0,5 A. 3.1. Tendo em conta que 1 ampére (A), a unidade de intensidade de corrente, corresponde à passagem de 1 coulomb (C) de carga por segundo, qual é a carga que passa em cada secção da lâmpada em 2 segundos?

3.2. Sabendo que a diferença de potencial eléctrico (em volts) indica a energia (em joules) transformada por cada coulomb de carga que passa na lâmpada, qual é a energia que esta recebe em 2 segundos?

the answer is 3.1 his answer is wrong mines is right

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

a skateboard rolling across the street - apex