How does quantum theory explain the emission spectra of atoms A. Electrons slowly gain energy in a continuous fashion

B. The movement of an electron between energy levels occurs gradually a small amount of energy are absorbed

C. Each motion of an electron between energy levels is associated with a single, specific amount of energy

D. Electrons absorb the energy they need to jump to a higher energy level from any light source above a minimum energy

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i think its b

Explanation:

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answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.