Who invented Phillips rechargeable led bulb​

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

What is similar between metals and suspensions

Definition: this is the weighted average of all of the isotopes of an element.