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 from these data.
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When 100 V DC is applied across a solenoid, a steady current of 1 A flows in it. when 100V AC is applied across the same solenoid, the current drops t
Correct Answer - A `R=100/1=100 Omega , x=sqrt(Z^(2)-R^(2))` `Z=100/0.5=200 Omega , L=x/omega=1/3H`.
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An alternating voltage of frequency `f` is applied across a series `LCR` circuit.Le `f_(r)` be the resonance frequency for the circuit.Will the curren
`X_(L)=2pifL` and `X_(C)=1/(2pifC)` (i)When `f gt f_(r),X_(L)` is large and `X_(C)` is small.The circuit is induction current lags behind the applied voltage. (ii)When `fltf_(r),X_(L)` is small and `X_(C)` is large.The...
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Dimension of Planck Constant is
Correct answer is (A) ML2T-1
2 Answers 1 views
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 c
Correct Answer - `Cu (Z = 29)`
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`
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The voltage across the electrodes of a cathode ray tube is `1000 V`. Calculate the speed of the electron. Given mass of an electron `=.1xx10^(-31)kg`
Correct Answer - `1.875 xx10^(7)ms^(-1)`
2 Answers 3 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]`
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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
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
An open glass tube is immersed in mercury so that a length of `8 cm` of the tube projects above the mercury. The tube is then closed and raised throug
Correct Answer - `15.4 cm`
2 Answers 1 views