Answer: 4.99×10²³ photons
Explanation: The energy of a photon is given as
E= hf
h= Planck constant = 6.626×10^-34Js
f= frequency = c/x
C= speed of light = 3×10^8 m/s
x= wavelength= 525nm= 525×10^-9
E= hc/x
E= 6.626×10^-34 × 3×10^8 m/s /( 525×10^-9)
E= 3.79×10^−19 J/ Photon
E= 3.79×10^−22KJ/Photon
189KJ/3.79×10^−22KJ/photon=
4.99×10²³photons.
Therefore the number of photons is
4.99×10²³photons.
Answer:
80.7 L
Explanation:
PV = nRT
P = 1520 mmHg = 2 atm
n = 5 mol
R = 0.08206 (L * atm)/(mol * K)
T = 393.15 K
2 (V) = 5 (0.08206) (393.15)
V ≈ 80.7 L
Explanation:
Pumice is an extrusive igneous rock that is produced through volcanic activities.
A rock like pumice will pass through the rock cycle and be transformed to other rock types with time.
Pumice contains rich mafic minerals giving it that black appearance.
The consequences of this is that when the rock is acted upon by weathering elements, it is weathered to clay. A fine grained sediment. It will eventually be transformed to shale or claystone sedimentary rocks.
If is goes through the metamorphic path, a schist will form under conditions of high pressure and temperature. New minerals will grow and metamorphic transformation would be vivid.
Eventually, both sedimentary and metamorphic rocks can be subducted and will form the original melt again.
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<span>A pure substance contains only one kind of molecule, and a mixture is a combination of two or more pure substances.</span>
<span>Answer is an </span>alpha emission<span>
Alpha decay is an emission of </span>₂⁴He <span>nucleus. If an
element undergoes an alpha decay, the mass of the daughter nucleus formed is reduced
by 4 compared
to mass of parent atom and atomic number is reduced by 2 compared to atomic number of parent
atom.
</span><span>Here parent atom is </span>Sm<span> which has
atomic number as 62 and mass number as 146. Since the emitted particle is a </span>₂⁴He<span> nucleus this is an alpha decay. Daughter atom will
have </span>146 - 4 = 142<span> <span>as mass number and </span></span>62 - 2 = 60<span> <span>as atomic number. Hence, daughter atom should
be </span></span>Nd<span> which has atomic number as 60.</span><span>
</span>
