Answer:1-D(intake) 2-B(compression) 3-A(ignition/power) 4-C(exhaust)
Explanation:
A four-stroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle.
The intake event is when the air-fuel mixture is introduced to fill the combustion chamber
The compression stroke is when the trapped air-fuel mixture is compressed inside the cylinder
The power stroke is an engine operation Stroke in which hot expanding gases force the piston head away from the cylinder head.
The exhaust stroke occurs whenspent gases are expelled from the combustion chamber and released to the atmosphere.
Sound requires a medium to travel. Sound cannot travel in vacuum in space while light can. Therefore, the receiver from earth receives only light sent from moon, not sound.
Explanation:
- Sound is created by vibrations that requires medium to travel. The medium can be solid, liquid, or gas. Whatever it is, a medium is required.
- In space, there is no solid, liquid, or gas. In other words, it is vacuum. Sound waves cannot travel through vacuum.
- Light waves, on the other hand, can travel through vacuum. Hence, if the transmitter on moon emits sound waves and light waves, receiver from earth picks only the light waves.