Technician A says that a wastegate is used on most turbocharger systems to limit and control boost pressures. Technician B says that a relief valve is also used to keep the speed of the turbine wheel from speeding up during engine deceleration. Who is righ

Technician A says that a wastegate is used on most turbocharger systems to limit and control boost pressures.

Explanation:

A wastegate is a device used to control the boost pressure of turbocharge systems. This is achieved by restricting the exhaust gases in the system due to the exhaust gases providing the required pressure in the turbocharged system.

A good importance of the wastegate is protection of the engine and the turbocharged system.

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 answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.