The dominant wavelength of energy emitted by the sun is

.   The answer is; A Shorter than that emitted by the earth

When the electromagnetic radiations from the sun hit the earth, they  may be reflected back to space, absorbed by the earth, or scattered. These cause some energy to be lost from the radiation from the sun. The radiation emitted from the earth is therefore of lower energy. This means they have a larger wavelength and longer frequencies.  

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