Physics-
General
Easy
Question
Moseley’s law for characteristic X-rays is √v=a (Z-b) null. In this,
- both a and b are independent of the material
- a is independent but b depends on the material
- b is independent but a depends on the material
- both a and b depend on the material
The correct answer is: both a and b are independent of the material
Both a and b will be independent of material.
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In an experiment of photo-electric effect, singly ionized ‘He’ is excited electronically to different energy levels. The emission spectra of the He hence produced is made incident on a photoelectric plate in the photo-cell. When He is excited to fourth energy level then the observed stopping potential of photo –cell is found to be five times the stopping potential when hydrogen is excited to third energy level. The work function of the material of the photo electric plate is
In an experiment of photo-electric effect, singly ionized ‘He’ is excited electronically to different energy levels. The emission spectra of the He hence produced is made incident on a photoelectric plate in the photo-cell. When He is excited to fourth energy level then the observed stopping potential of photo –cell is found to be five times the stopping potential when hydrogen is excited to third energy level. The work function of the material of the photo electric plate is
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Moseley’s law for characteristic X-rays is √v=a (Z-b) null. In this,
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Physics-General
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Physics-General
Chemistry-
When the pressure is considerably high, Vm will be quite small. The pressure correction 
may become negligible and van der Waal’s equation reduces to
P (Vm – nb) = nRT
This explains why the PVm, after reaching a minimum value, increases with increase in pressure. For a real gas, PV versus P plot is not linear. Hence r/P or m/PV is not independent of P,. For calculation of r and molecular mass M, we must obtain r/P at P =0. As P ® 0,
P(V – nb) = nRT
Þ 
\ 
The nature of graph plotted for P on x-axis versus r/P on y-axis will be:
When the pressure is considerably high, Vm will be quite small. The pressure correction may become negligible and van der Waal’s equation reduces to
P (Vm – nb) = nRT
This explains why the PVm, after reaching a minimum value, increases with increase in pressure. For a real gas, PV versus P plot is not linear. Hence r/P or m/PV is not independent of P,. For calculation of r and molecular mass M, we must obtain r/P at P =0. As P ® 0,
P(V – nb) = nRT
Þ
\
The nature of graph plotted for P on x-axis versus r/P on y-axis will be:
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Physics-General
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Chemistry-General
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Reason : The displacement is the longest distance between initial and final position.
Physics-General
