Answer:
a) λ = 121.5 nm
, b) 102.6, 97, 91.1 nm
Explanation:
Bohr's model describes the energy of the hydrogen atom
= k² e² / 2m (1 / n²)
A transition occurs when the electron passes from n level to a lower one
- = k² e² / 2m (1 / ² - 1 / ²)
Planck's relationship is
E = h f = h c / lam
hc /λ = k² e²/ 2m(1 / ² - 1 / ²)
1 / λ = [k² e² / 2m h c] (1 / ² - 1 / ²)
1 /λ = Ry] (1 / ² - 1 / ²)
a) the first element of the series occurs for = 2
1 / λ = 1.097 10⁷ (1- 1/2²)
1 / λ = 1.097 10⁷ (1- 0.25)
1 / λ = 0.82275 10⁷
λ = 1.215 10⁻⁷ m
λ = 1,215 10⁻⁷ m (10⁹nm / m)
λ = 121.5 nm
b) the next elements of the series occur to
1 /λ λ (10-7m) λ (nm)
3 1 1,097 10⁷ (1-1 / 9) 1,0255 102.6
4 1 1,097 10⁷ (1-1 / 16) 0.9723 97.2
∞ 1 1,097 10⁷ (1 - 0) 0.91158 91.1
Answer:
1.7 × 10^11 Pa
Explanation:
Please see the attachments below
Answer:
The spheres interact with one another, and a change in one might result in a change in another. Humans (biosphere) plough the fields with agricultural machinery made of geosphere materials, while the atmosphere (hydrosphere) provides precipitation to water the plants. The biosphere is home to all living organisms on the earth.
Explanation:
don't ask qestionsmm
Answer:
1.35 V
Explanation:
Given:
Capacitance of the capacitor (C) = 1.3 μF =
Frequency (f) = 3.9 kHz= 3.9 × 1000 Hz = 3900 Hz [1 kHz = 1000 Hz]
Current flowing in the circuit (I) = 43 mA = 0.043 A [1 mA = 0.001 A]
Now, as only capacitor is there in the circuit, the impedance of the circuit is equal to the reactance of the capacitor.
So,
The reactance of the capacitor is given as:
Plug in the values given and solve for . This gives,
Therefore, the impedance is,
Now, the voltage needed to create the given current is obtained using the formula from Ohm's law and is given as:
Therefore, the voltage needed to create a current of 43 mA is 1.35 V.
Answer:
It is because it cannot be used time again and again.