Answer:
when an electron made a transition from an outer orbit to one closer to the nucleus
Explanation:
Bohr amended that view of the motion of the planetary electrons to bring the model in line with the regular patterns (spectral series) of light emitted by real hydrogen atoms. ... Light, he proposed, radiated from hydrogen atoms only
Answer:
B) more current.
Explanation:
When two lamps are connected in series then we have
![R = R_1 + R_2](https://tex.z-dn.net/?f=R%20%3D%20R_1%20%2B%20R_2)
now let the two lamps are identical
so we have
![R_1 = R_2 = R](https://tex.z-dn.net/?f=R_1%20%3D%20R_2%20%3D%20R)
now the total resistance of the lamps is given as
![R_{eq} = R + R](https://tex.z-dn.net/?f=R_%7Beq%7D%20%3D%20R%20%2B%20R)
now the current in that case is given as
![i = \frac{V}{R_{eq}}](https://tex.z-dn.net/?f=i%20%3D%20%5Cfrac%7BV%7D%7BR_%7Beq%7D%7D)
![i = \frac{V}{2R}](https://tex.z-dn.net/?f=i%20%3D%20%5Cfrac%7BV%7D%7B2R%7D)
Now when lamps are connected in parallel
net resistance of two lamps is given as
![\frac{1}{R_eq} = \frac{1}{R} + \frac{1}{R}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7BR_eq%7D%20%3D%20%5Cfrac%7B1%7D%7BR%7D%20%2B%20%5Cfrac%7B1%7D%7BR%7D)
so now we have
![\frac{1}{R_{eq}} = \frac{2}{R}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7BR_%7Beq%7D%7D%20%3D%20%5Cfrac%7B2%7D%7BR%7D)
so we have
![R_{eq} = \frac{R}{2}](https://tex.z-dn.net/?f=R_%7Beq%7D%20%3D%20%5Cfrac%7BR%7D%7B2%7D)
so now the current through the battery will be
![i = \frac{V}{R/2} = \frac{2V}{R}](https://tex.z-dn.net/?f=i%20%3D%20%5Cfrac%7BV%7D%7BR%2F2%7D%20%3D%20%5Cfrac%7B2V%7D%7BR%7D)
So current will be more when two lamps are connected in parallel
Answer:
The speed of the chair just before impact is 22.54 m/s
Explanation:
From the question,
The chair was initially at rest, that is, the initial velocity of the chair is 0 m/s.
Since the chair was thrown from a balcony, the chair will fall freely due to gravity.
To determine the speed of the chair just before impact, we will determine the final velocity of the chair.
From one of the equations of linear motion for objects falling freely due to gravity,
v = u + gt
Where v is the final velocity
u is the initial velocity
g is the acceleration due to gravity (Take g = 9.8 m/s²)
and t is time
From the question,
u = 0 m/s
t = 2.3 secs
Then, v = u + gt becomes
v = 0 + (9.8)(2.3)
v = 9.8 × 2.3
v = 22.54 m/s
Hence, the speed of the chair just before impact is 22.54 m/s.
Dark energy is the name given to the mysterious force that's causing the rate of expansion of our universe to accelerate over time, rather than to slow down. That's contrary to what one might expect from a universe that began in a Big Bang. Astronomers in the 20th century learned the universe is expanding.