The number of always differs in atoms of different elements

The metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off. this simple process iswhich kind of a change? a.a physical changeb. a chemical changec. a nuclear changed. an ionic change

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.