Light behaves: a=Always as a wave
b=As massive particles
c=Sometimes as a wave sometime as a particle
d=None of the above ​

Light behaves Sometimes as a wave sometime as a particle.

It is called dual nature of light.

spectral lines lyman is one set

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.