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A beam of 350 keV electrons a molybdenum...

A beam of 350 keV electrons a molybdenum target, generating the X-rays. What is the cut-off wavelength?

A

3.55 pm

B

400 pm

C

1595 pm

D

182 pm

Text Solution

Verified by Experts

The correct Answer is:
A
When the colliding electron remove an electron from innermost K-shell (corresponding to n=1) of atom and electron from some higher shell jumps to K-shell to fill up this vacancy, characteristic X-ray of K-series are obtained

`thereforeK_(alpha) and K_(beta)` X-rays are emitted when there is transition of electron between the levels n=2 to n=1 and n=3 to n=1 respectively.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ATOMS, MOLECULES AND NUCLEI -Exercise 1 (TOPICAL PROBLEMS)
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  5. X-ray of wavelength lamda=2 Å is emitted from the metal target. The po...

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  6. If a source of power 4 kW produces 10^(20) photons//second, the radiat...

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  7. A nucleus splits into two nuclear parts having radii in the ratio 1:2 ...

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  8. The mass defect in a particular nuclear reaction is 0.3 grams. The amo...

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  9. Number of neutrons in C^(12) and C^(14) are

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  10. The density of a nucleus of mass number A is proportional to

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  11. The stable nucleus that has a radius 1//3 that of Os^(189) is-

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  14. If M(A,Z), M(p)and M(n) denote the masses of the nucleus .(Z)X^(A), pr...

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  15. What is the Q-value of the reaction? ""^(1)H+""^(7)Lito ""^(4)He+""^...

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  16. Binding energy per nucleon relation with mass number

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  17. The curve of blinding energy per nucleon as a function of atomic mass ...

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  18. Atomic mass of ""6C^(13) is 1300335 amu and its mass number is 13.0 If...

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  19. Let N(beta) be the number of beta particles emitted by 1 gram of Na^(2...

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  20. A radioactive decay can form an isotope of the original nucleus with t...

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