Answer : A. It decreases and then increases.
Explanation : Troposphere is the lowermost layer of atmosphere.
Stratosphere is next layer up to the troposphere. As the jet descends from stratosphere towards the troposphere, the temperature initially decreases and then at troposphere is roughly constant and then steadily increases.
So, option (A) is correct.
Answer:
A. The frequencies of EMR it emits depend on its temperature
B. It emits only one frequency of EMR
C. It absorbs most of the EMR it receives
Explanation:
- A blackbody is an object that absorbs most of the electromagnetic spectrum of energy that falls on it.
- According to law to reradiates most of the available energy back on top the outer space at an efficiency of 100% and thus radiation may be in the visible range of temperature than are in 1000K.
Explanation:
Wheelchair ramp
An inclined plane, also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load.
Answer:

Explanation:
Let f is frequency of of the guitar string
Frequency of tuning fork is given 487 Hz
Beat frequency is difference frequencies of guitar string and the tuning fork
It could be
(f - 487Hz)
or
(487Hz-f)
As it is mentioned that as the frequency of guitar string increases the beat frequency decreases
So the beat frequency is given as

Low-energy light bulbs also save money in the long run.
<h3>Mathematical operations</h3>
Cost of 1 low-energy bulb = 400 P
Cost of 1 filament buld = 50 P
Cost of electricity for 1 hour for low-energy bulbs = 0.2 p
Cost of electricity for 1 hour for filament bulb = 1.0 p
Total cost of electricity for 10,000 hours for low-energy bulb:
10,000 x 0.2 p = 2,000 p
Total cost of electricity for 10,000 hours for filament bulb:
10,000 x 1.0 = 10,000 p
Total cost of low-energy bulb + electricity = 2,000 + 400
= 2,400 p
Total cost of filament bulb + electricity = 10,000 + 50
= 10, 050 p
Thus, low-energy bulbs may have an initial higher cost, but they save a significant amount of money in the long run.
More on energy-saving bulbs can be found here:brainly.com/question/13144449
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