Moseley’s Law

IMPORTANT

Moseley’s Law: Overview

This topic covers concepts, such as, Different Series in Characteristic X-rays, Wavelength and Energy of Emitted X-ray Photons, Identifying Elements from X-ray Spectrum, Bragg's Diffraction & Moseley's Law in Characteristic X-rays etc.

Important Questions on Moseley’s Law

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The element which has a Kα x-rays line of wavelength 1.8Å is R=1.1×107 m-1, b=1 and 533=0.39

MEDIUM
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If Ni (nical) is used as target material, then λmin is minimum wavelength produced in X-ray tube and λkα is the wavelength of kα line. If the operating tube voltage is increased and Ca (calsium) is used as target material in place of Ni, then the difference λkα-λmin will :

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A student is jogging on a straight path with the speed 5.4 km per hour. Perpendicular to the path is kept a pipe with its opening 8 m from the road (see figure). Diameter of the pipe is 0.45 m At the other end of the pipe is a speaker emitting sound of 1280 Hz towards the opening of the pipes. As the student passes in front of the pipe, she hears the speaker sound for T seconds. T is in the range (take speed of sound, 320 ms-1):

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What is the atomic number of the element whose wavelength of Kα line of characteristic $X-$ray is 250 pm. (Rydberg constant =1.097×107 m-1

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The wavelength of a certain line in the X-rays spectrum for tungsten Z=74 is 200 A°. What would be the wavelength of the same line for platinum Z=78 ? The screening constant a is unity.

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A screen is place 50 cm from a single slit, which is illuminated with 6000 A light. If the distance between the first and third minima in the diffraction pattern is 3 mm, the width of the slit is

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Use Moseley's law with b=1 to find the frequency of the KαX -rays of La(Z=57). if the frequency of the KX -rays of Cu(Z=29)  is known to be 1.88×1018 Hz

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The wavelength of Kα line from an element of atomic number 51 is λ. From another element the wavelength of Kα line is 4λ. What is the atomic number of second element?
 

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A cobalt (atomic no. =27 ) target is bombarded with electrons and the wave lengths of its characteristic X-rays spectrum are measured. A second weak characteristic spectrum is also found due to an impurity in the target. The wavelength of the Kα lines are 225.0 pm (cobalt) and 100.0 pm (impurity). Atomic number of the impurity is

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If the Kα radiation of Mo Z=42 has a wavelength array of 0.7 Ao, calculate wavelength of the end array corresponding radiation of Cu, i.e., Kα for Cu Z=29 assuming b=1:-

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The order of energy of X-ray photon is :-

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For X-ray diffraction, order of size of obstacle is:

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What is the minimum wavelength of X-rays :-

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If the operating voltage of X-ray tube is 50 kV then velocity of X-ray :-

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In E.M. waves spectrum X-rays region lies between

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Absorption of X-ray is maximum in which of the following sheets?

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The wavelength of Kα line for an element of atomic number 43 is λ. Then what is the wavelength of Kα line for an element of atomic number 29 ?

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The wavelength of the X-rays produced by an X-ray tube is 0.76 Ao. What will be the atomic number of anode material?

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For characteristic X-ray of some material, which of the following must be true?

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The Kα X-rays arising from a cobalt (Z=27) target have a wavelength of 179 pm. Which of the following is true about the Kα X-rays arising from a nickel target (Z=28) ?