Advertisements
Advertisements
प्रश्न
Iron emits Kα X-ray of energy 6.4 keV. Calculate the times taken by an iron Kα photon to cross through a distance of 3 km.
(Use Planck constant h = 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Advertisements
उत्तर
Given:
Energy of the X-ray, E = 6.4 keV
Distance travelled by the photon, d = 3 km = 3 `xx ` 103 m
Time taken by the photon to cross the distance of 3 km is given by
`t = "Distance"/"Speed" = (3 xx 10^3)/(3 xx 10^8)`
`t = 10^-5 "s" = 10 xx 10^-6 "s"`
`t = 10 mus`
Both the Kα photon and X-ray will take the same time, that is, 10 μs , to cross the distance of 3 km.
APPEARS IN
संबंधित प्रश्न
Name the phenomenon which shows the quantum nature of electromagnetic radiation.
State an additional use of the X-rays waves
Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.
A wave has a wavelength of 10-3 nm. Name the wave.
What is the range of the wavelength of the following electromagnetic waves?
(a) Visible.
What is the range of the wavelength of the following electromagnetic waves?
(a) Infrared.
Name the waves produced by the changes in the nucleus of an atom.
In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?
X-ray incident on a material
(a) exerts a force on it
(b) transfers energy to it
(c) transfers momentum to it
(d) transfers impulse to it.
The X-ray coming from a Coolidge tube has a cutoff wavelength of 80 pm. Find the kinetic energy of the electrons hitting the target.
(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.)
Answer briefly.
Give two uses of radio waves.
An e.m. wave exerts pressure on the surface on which it is incident. Justify.
A car is moving towards a high cliff. The car driver sounds a horn of frequency f. The reflected sound heard by the driver has a frequency 2f. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be:
Microwaves are electromagnetic waves with frequency in the range of.
The ozone layer absorbs
Which is the correct ascending order of wavelengths?
Name two electromagnetic waves of wavelength smaller than that of violet light.
