The Mpemba effect is the name given to the assertion that it is quicker to cool water to a given temperature when the initial temperature is higher.
Marie Curie was a polish-french physicist and chemist who conducted pioneering research on radioactivity.
Answer:
f (frequency) = V / y where V is the speed of sound and y the wavelength
f = 1500 m/s / 1.5 m = 1000 / sec
T (period) = 1 / f = .001 sec
Suppose you replace the horn by a drum then the period would be the time between the beats of the drum - now if the source is moving towards the observer then the distance between crests of the wave produced by the drum will be shortened by V * T because of the motion of the drum "towards" the observer, and since the wavelength is shorter the frequency heard by the observer will be higher, and the higher the speed of of the car the shorter the wavelength as seen by the observer and the higher the frequency.
Also, if the car is moving away from the observer then the distance between the crests of the wave emitted will be further apart, and the observer will hear a lower frequency.
<span>that statement is true.
In walking process, we need the force of friction so our feet could pushed back agains the ground. Without the force of friction it would be really hard to stand. And even we could stand, we will be sliding all over the place when we try to walk.</span>
The choices you've posted don't include any graph that shows it.
Energy decreases as it moves uptrophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.Trophic level transfer efficiency (TLTE) measures the amount of energy that is transferred between trophic levels.
