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grin007 [14]
3 years ago
11

Choose the statement(s) that is/are true about Bohr model of the atom. (i) Electron energies are quantized and they can assume o

nly certain discrete energy values. (ii) An electron receiving extra energy could transfer to a higher energy level. (iii) An electron falling from a high energy level to a low energy level will radiate the excess energy in the form of electromagnetic radiation. (iv) An electron can be stripped off an atom by giving it sufficient energy.
Physics
1 answer:
GuDViN [60]3 years ago
6 0

Answer:

All of the statements are correct corresponding to Bohr's model of atom.

Explanation:

The postulates of Bohr's model of atom are:

1) Electron's revolve around nucleus in stationary states with constant energy levels.

2) The angular momentum of the electrons is quantised.

3) Electron's can change their stationary states by either absorbing energy if it moves to a state of higher energy or emitting radiations if it moves to a lower stationary state from higher state.

4) While revolving in an orbit an electron does not change it's energy.

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Answer:

50kg.m/s

Explanation:

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7 0
3 years ago
A kangaroo jumps straight up to a vertical height of 1.45 m. How long was it in the air before returning to Earth?
dexar [7]

Answer:

1.08 s

Explanation:

From the question given above, the following data were obtained:

Height (h) reached = 1.45 m

Time of flight (T) =?

Next, we shall determine the time taken for the kangaroo to return from the height of 1.45 m. This can be obtained as follow:

Height (h) = 1.45 m

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Time (t) =?

h = ½gt²

1.45 = ½ × 9.8 × t²

1.45 = 4.9 × t²

Divide both side by 4.9

t² = 1.45/4.9

Take the square root of both side

t = √(1.45/4.9)

t = 0.54 s

Note: the time taken to fall from the height(1.45m) is the same as the time taken for the kangaroo to get to the height(1.45 m).

Finally, we shall determine the total time spent by the kangaroo before returning to the earth. This can be obtained as follow:

Time (t) taken to reach the height = 0.54 s

Time of flight (T) =?

T = 2t

T = 2 × 0.54

T = 1.08 s

Therefore, it will take the kangaroo 1.08 s to return to the earth.

3 0
3 years ago
3. Waxing means "growing." Waning means
Sonja [21]

Answer:

I think it is the last one.

Explanation:

I am not sure because i am stuck on this one, too.

4 0
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Explanation:

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I got answer c but im not 100% sure 

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