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Modern Physics

Blazing goIITian

Joined:	5 Dec 2007
Post:	704

5 Apr 2008 22:30:18 IST

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384

do or die

None

do dis

iron emits K

X-ray of energy 6.4 keV & calcium emits K

X-ray of energy 3.69 keV calculate d times taken by an iron K

photon & a calcium K

photon to cross thru a distance of 3km

A radio activ sample at any instant has its disintegration rate 5000 disintegrations/minute . after 5 minutes d rate is 1250 disintegrations/min d decay constant [per minute] is [ ans: 0.1ln2]

A hydrogen atom in state n=6 makes 2 successive transitions & reaches d ground state. in d 1st transition a photon of 1.13eV is emmitted

a)find d energy of d photon emmitted in d 2nd transition

b)what is d value of n in d intermediate state?

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Comments (4)

boredom

Blazing goIITian

Joined: 14 Jan 2007

Posts: 602

8 Apr 2008 12:29:07 IST

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Hey,

the second one...

dN/dT=-

N/N"=4

(t)=lnN0/N

(T₂-T₁)=ln(4)

=1/5(ln4)

.1ln2

=.1ln2.

dont u know me

Blazing goIITian

Joined: 5 Dec 2007

Posts: 704

8 Apr 2008 22:12:40 IST

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hey srini uve committed a mistake plz check ur medod 1st by ur medod im getting 2log2/5 not 0.1log2

boredom

Blazing goIITian

Joined: 14 Jan 2007

Posts: 602

8 Apr 2008 22:17:18 IST

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Hey,

But where,could you post your solution?

boredom

Blazing goIITian

Joined: 14 Jan 2007

Posts: 602

9 Apr 2008 22:47:05 IST

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Hey,

For that Kalpha ...

the velocity will be that of light 3*10^8 so time will be a3*10^3/3*10^8=10^-5 seconds

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