¿Qué indicadores se utilizan habitualmente para reconocer una sustancia acida? ¿A qué color cambia cada uno de ellos?

True or false: the revolution of the earth creates day and night as it rotates around the sun

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?