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
How are infrared waves produced?
Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals
Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.
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 potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength
Find the cutoff wavelength for the continuous X-rays coming from an X-ray tube operating at 30 kV.
(Use Planck constant h = 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
The electric current in an X-ray tube (from the target to the filament) operating at 40 kV is 10 mA. Assume that on an average, 1% of the total kinetic energy of the electron hitting hte target are converted into X-rays.
(a) What is the total power emitted as X-rays and (b) how much heat is produced in the target every second?
The wavelength of Kα X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell of a tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having tungsten target which allows production of Kα X-ray?
(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 Infra-red waves
Name the radiation of the electromagnetic spectrum which is used for the following:
To photograph internal parts of the human body and Give the frequency range
State two uses of infrared radiations.
An e.m. wave exerts pressure on the surface on which it is incident. Justify.
Which of the following is a tool used for separating the different color wavelengths from each other?
For television broadcasting, the frequency employed is normally
Given below in the left column are different modes of communication using the kinds of waves given in the right column.
| A. | Optical Fibre Communication |
P. | Ultrasound |
| B. | Radar | Q. | Infrared Light |
| C. | Sonar | R. | Microwaves |
| D. | Mobile Phones | S. | Radio Waves |
From the options given below, find the most appropriate match between entries in the left and the right column.
Identify the electromagnetic wave whose wavelength range is from about 10-12 m to about 10-8 m. Write one use of this.
Identify the electromagnetic wave whose wavelength range is from about 10-3 m to about 10-1 m. Write one use of this.
