Advertisements
Advertisements
प्रश्न
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,
विकल्प
VA > VB, ZA > ZB
VA > VB, ZA < ZB
VA < VB, ZA > ZB
VA > VB, ZA < ZB
Advertisements
उत्तर
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
संबंधित प्रश्न
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
Name the phenomenon which shows the quantum nature of electromagnetic radiation.
Why are infra-red waves often called heat waves? Explain.
What is the range of the wavelength of the following electromagnetic waves?
(a) Gamma rays.
Give the range of wavelength of the electromagnetic waves visible to us.
Name the radiations of wavelength just shorter than 4 × 10-7 m.
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 between the cathode and the target.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
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?
State three properties of infrared radiations similar to that of visible light.
Name the radiations used for the detection of fracture in bones.
Answer briefly.
Why are microwaves used in radar?
Answer briefly.
Can we produce a pure electric or magnetic wave in space? Why?
Calculate the wavelength of a microwave of a frequency of 8.0 GHz.
An e.m. wave exerts pressure on the surface on which it is incident. Justify.
The fundamental frequency of an open organ pipe is 300 Hz. The first overtone of this pipe has same frequency as first overtone of a closed organ pipe. If speed of sound is 330 m/s, then the length of closed organ pipe is:
For television broadcasting, the frequency employed is normally
In uranium (Z = 92) the K absorption edge is 0.107 Å and the Kα line is 0.126 Å, and the wavelength of the L absorption edge is ______.
Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.
Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.
