A proton, with mass 1.67x10^-27 kg and charge 1.6x10^-19, is sent with velocity 2.3x10^4 m/s in the x direction into a region where there is a uniform electric field of magnitude 780 V/m in the y direction. What must be the magnitude and direction of the uniform magnetic field in the region if the proton is to pass through undeflected

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.