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yarga [219]
4 years ago
13

select the correct relationship of the densities of the given substances: !●water < iron < aluminium < mercury ● Iron &

lt; water < mercury < aluminium ● water < aluminium < iron < mercury ● none of the above​. asap plz!!!
Physics
1 answer:
Yanka [14]4 years ago
6 0

Answer:

option a is correct

Explanation:

water ∠iron∠aluminium∠mercury

water density =1.0000

iron =7.487

aluminium=2.07

mercury=13.59

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A 1 mW laser beam is incident onto a detector. Determine the fractional fluctuation in number of photons intercepted by the dete
Ugo [173]

Answer:

(a) 625 photons

(b)625\times 10^{6}photons

Explanation:

Given that , the power of the laser beam is,

P=1 mW\\P=1\times 10^{-3} W

and time is given is,

t=1\mu s\\t=10^{-6}s

Now the energy formula for the laser beam is,

E=P\times t

Now,

E=10^{-3}\times 10^{-6}  \\E=10^{-9}J

(a) The value of energy is given,

E_{1}=10MeV\\E_{1}=10\times 10^{6}\times 1.6\times 10^{-19}J\\ E_{1}=16\times 10^{-13}J

Now the no of photons's fraction fluctuation is,

n=\frac{E}{E_{1} }\\ n=\frac{10^{-9} }{16\times 10^{-13} }\\ E_{1}=625 photons

Therefore the no of photons is 625 photons.

(b)The value of energy is given,

E_{z}=10eV\\E_{z}=16\times 10^{-19}J

Now the no of photons's fraction fluctuation is,

n=\frac{E}{E_{z} }\\ n=\frac{10^{-9} }{16\times 10^{-19} }\\n=625\times 10^{6}photons

Therefore the no of photons is625\times 10^{6}photons.

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Answer:

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