Bohr explained that the electron revolve around a orbit of fixed energy level that Rutherford fails to explain !!!
Your answer is D- high energy and short wavelengths : )
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The net force on the box parallel to the plane is
∑ F[para] = mg sin(24°) = ma
where mg is the weight of the box, so mg sin(24°) is the magnitude of the component of its weight acting parallel to the surface, and a is the box's acceleration.
Solve for a :
g sin(24°) = a ≈ 3.99 m/s²
The box starts at rest, so after 7.0 s it attains a speed of
(3.99 m/s²) (7.0 s) ≈ 28 m/s
Answer:
The ratio of the translational rms speed in the ionosphere to the translational rms near the earth's surface is 
Explanation:
The relation between the translational rms speed and the temperature is given by :

So, 
When the temperature is three times greater.

The ratio of the translational rms speed in the ionosphere to the translational rms near the earth's surface is :

Hence, this is the required solution.