When the voltage applied to an X-ray tube increases from `10` to `20 kV` the wavelength difference between the ka line and the short wave cut-off of continuous X-ray spectrum increases by a factor of `3.0`. Identify the target element. Take `4/3R = 1200 Å` where R is Rydberg’s contant and `hc = 12.4 keV Å`
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On operating an X-ray tube at 1 kV. X-rays of minimum wavelength `6.22Å` are producd. I fht tube is operated at `10 kV`, then the minimum wavelength o
Correct Answer - A `lambda_(mn)prop (1)/(V) so (lambda)/(6.22) = (1)/(10) rArr lambda_(min)=0.622 A`
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Cut off potential for a metal in photoclectric effect for light of wavelength `lambda_(1), lambda_(2)` and `lambda_(3)` is found to be `V_(1),V_(2)` a
Correct Answer - C `eV_(1)=(hc)/lambda_(1) - phi, eV_(2)=(hc)/lambda_(2) - phi, eV_(3)=h_(0)/lambda_(3)-phi` if `2V_(2)=V_(1)+V_(3) implies 2/lambda_(2)=1/lambda_(1)+1/lambda_(2)` harmonic progression
2 Answers 1 views
An X-ray tube has nickel as target. The wavelength difference between the ka X-ray and the cut-off wavelength of continuous X-ray spectrum is 84 pm. F
Correct Answer - `14.8 kV`
2 Answers 1 views
In a cathode ray tube a potential difference of `3000` volt is maintained between the electrodes `2 cm` apart. A magnetic field of `2.5xx10^(-4) Wb//m
Correct Answer - `1.8 xx 10^(11) C kg^(-1)`
2 Answers 1 views
An X-ray tube produces a continuous spectrum of radiation with its short wavelength end at `0.66 Å`. What is the maximum energy of the photon in the r
Correct Answer - `3.0 xx 10^(-15) J`
2 Answers 1 views
What potential difference should be applied across an X-ray tube to get X-ray of wavelength not less than 0.10 nm? What is the maximum energy of a pho
Correct Answer - `[12.431 kV,1.99 xx10^(-15) J]`
2 Answers 1 views
Find the maximum potential difference which may be applied across an X-ray tube with tungsten target without emitting any characteristics K or L X-ray
Correct Answer - [Less than 11.3 kV]
2 Answers 1 views
The distance between the cathode (filament) and the target in an X-ray tube is 1.5 m. If the cutoff wavelength is 30 pm, find the electric field betwe
Correct Answer - `27.7 kV//m`
2 Answers 1 views
When 40 kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of `9.7 xx 10 ^18` Hz. Calculate the value of Planck constant f
Correct Answer - `4.12 xx 10^(-15) eV_(-s)`
2 Answers 1 views
An x-ray tube is operated at `20 kV` and the current through the tube is `0*5 mA`. Find (a) the number of electrons hitting the target per second, (b)
Correct Answer - `10`
2 Answers 1 views