How does the wave model of electrons orbiting the nucleus account for the fact that the electrons can have only discrete energy values? a. electrons are able to vibrate only at particular frequencies. b. when an electron wave is confined, it is reinforced only at particular frequencies. c. the energy values of an electron occur only where its wave properties have a maximum amplituded. the wave model accounts for the shells an electron may occupy, not its energy levels.

b. When an electron wave is confined, it is reinforced only at particular frequencies.

it breaks and dirupture other materials and other sencews from the bottom

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s