Advertisements
Advertisements
प्रश्न
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.)
Advertisements
उत्तर
Given:
Distance between the filament and the target in the X-ray tube, d = 1.5 m
Cut off wavelength, `lambda = 30 "pm"`
Energy (E) is given by
`E = (hc)/lambda`
Here,
h = Planck's constant
c = Speed of light
`lambda` = Wavelength of light
Thus, we have
`E = (1242 "eV" - "nm")/(30 xx 10^-3)`
⇒ `E = (1242 xx 10^-9)/(30 xx 10^-12)`
⇒ `E = 41.4 xx 10^3 "eV"`
Now ,
`"Electric field" = V/d = (41.4 xx 10^3)/1.5`
= `27.6 xx 10^3 "V/m"`
= `27.6 "kV/m"`
APPEARS IN
संबंधित प्रश्न
Name the parts of the electromagnetic spectrum which is
used to treat muscular strain.
Write in brief, how these waves can be produced.
Give one use of microwaves.
Name the rays or waves of highest frequency .
Name the waves used for taking photographs in dark.
Name three properties of ultraviolet radiations which are similar to visible light.
The wavelength of X-rays is 0.01 Å. Calculate its frequency. State the assumption made, if any.
Consider a photon of a continuous X-ray coming from a Coolidge tube. Its energy comes from
If the current in the circuit for heating the filament is increased, the cutoff wavelength
One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?
Visible light passing through a circular hole forms a diffraction disc of radius 0.1 mm on a screen. If an X-ray is passed through the same setup, the radius of the diffraction disc will be
When 40 kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of 9.7 × 1018 Hz. Calculate the value of Planck constant from these data.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Suppose a monochromatic X-ray beam of wavelength 100 pm is sent through a Young's double slit and the interference pattern is observed on a photographic plate placed 40 cm away from the slit. What should be the separation between the slits so that the successive maxima on the screen are separated by a distance of 0.1 mm?
Name the scientist who discovered Visible light
Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.
If λv, λx and λm Am represents the wavelength of visible light, x-ray and microwaves respectively, then ______.
Why does microwave oven heats up a food item containing water molecules most efficiently?
Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong?
Which devices commonly produce microwaves?
How does the frequency of infrared radiation compare with that of microwaves?
How does the frequency of violet light compare with that of red light?
