Advertisements
Advertisements
Question
The figure shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes. The solid curve represents the relation for the tube A in which the potential difference between the target and the filament is VA and the atomic number of the target material is ZA. These quantities are VB and ZB for the other tube. Then,
Options
VA > VB, ZA > ZB
VA > VB, ZA < ZB
VA < VB, ZA > ZB
VA > VB, ZA < ZB
Advertisements
Solution
VA > VB, ZA < ZB
It is clear from the figure that the X-ray of tube A has less cutoff wavelength than the X-ray of tube B.
`therefore lambda_A < lambda_B`
Using Moseley's Law,
`Z_A < Z_B`
`lambda ∝ 1/V` , where V is the voltage applied in the X-ray tube.
`therefore V_A > V_B`
APPEARS IN
RELATED QUESTIONS
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1019 Hz belong?
What is the range of the wavelength of the following electromagnetic waves?
(a) Ultraviolet
State the approximate range of wavelength associated with visible light.
Name the radiations of wavelength just shorter than 4 × 10-7 m.
Name the waves used for taking photographs in dark.
In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?
Mark the correct options.
(a) An atom with a vacancy has smaller energy that a neutral atom.
(b) K X-ray is emitted when a hole makes a jump from the K shell to some other shell.
(c) The wavelength of K X-ray is smaller than the wavelength of L X-ray of the same material.
(d) The wavelength of Kα X-ray is smaller than the wavelength of Kβ X-ray of the same material.
The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of Kα, Kβ and Lα X-rays of silver.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
An X-ray tube operates at 40 kV. Suppose the electron converts 70% of its energy into a photon at each collision. Find the lowest there wavelengths emitted from the tube. Neglect the energy imparted to the atom with which the electron collides.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name the scientist who discovered
X-rays
Name the scientist who discovered Microwaves
Name the radiation which can be detected by thermopile.
To which regions of the electromagnetic spectrum do the following wavelengths belong:
(a) 250 nm
(b) 1500 nm
Name the part of the electromagnetic spectrum which is:
Produced by bombarding a metal target with high electrons.
Name the radiation of the electromagnetic spectrum which is used for the following:
Radar and Give the frequency range.
How will you investigate the existence of the radiation beyond the red and violet extremes of the spectrum?
Calculate the wavelength of a microwave of a frequency of 8.0 GHz.
Choose the correct option related to wavelengths (λ) of different parts of the electromagnetic spectrum.
What is the speed of radio waves in vacuum?
