Explanation:
It is given that peak (maximum) emission of star is 300 nm.
And, it is known that according to Wein's displacement relation between wavelength and temperature is as follows.
= 2898 micrometer.K
Hence, putting the given values into the above formula as follows.
= 2898 micrometer.K
= 2898 \times 10^{-6} meter.K
T =
K
= 9660 K
Thus, we can conclude that the estimated surface temperature of star is 9660 K.
Answer:
From left to right
Neutral
Acid
Base
Explanation:
So using HSAB theory hard and soft (Lewis) acids and bases.
OH - Is a Hard Base
H+ Strong Acid
POh is calculated by the negative logarithm of hydroxide ions concentration. From the given value, we have:
<span>pOH = -log(8.6 x 10 ^-5)
</span><span>pOH = 4.07
</span><span>
To calculate the pH we use the relation of pOH and pH, expressed as:
</span><span>
14 = pOH + pH
</span><span>pH = 14 - 4.07 = 9.93
</span><span>pH = -log [H+]
</span><span>[H+] = 10^-9.93 = 1.16 x 10^-3 M</span>
Answer:
Potassium is an alkali metal
Explanation:
Symbol: K
Atomic number: 19
Atomic mass: 39.0983 u
Electron configuration: [Ar] 4s¹
Van der Waals radius: 280 pm
Electronegativity: 0.82
Answer:
53.28%
(you could also write 55.33%, but I rounded it so just go with the answer above ---> 53.28%)
Explanation: