Humans have destroyed natural controls out of ignorance true or false

What is the frequency of a light wave with a wavelength of 620nm

After a car's engine has been running for a while, if you stand near the car's engine you can often feel heat coming from the engine as a result of a. radiation b. convection c. conduction

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?