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13. Which light bulb in the circuit will be the brightest?
a) A b)B c) d) A and B e) they will all be the same brightness
14. When light bulb B is disconnected, what change will be observed in light bulb A?
a) it will get brighter
b) it will get dimmer
c) it will go out
d) no change will be observed
15. When light bulb B is disconnected, what change will be observed in light bulb C?
a) it will get brighter
b) it will get dimmer
c) it will go out
d) no change will be observed

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

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.