Advertisements
Advertisements
प्रश्न
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.)
Advertisements
उत्तर
Given:
Voltage of the X-ray tube, V = 30 kV
Cutoff wavelength for continuous X-rays (λ) is given by
`λ = (hc)/(eV)`
Here ,
h = Planck's constant
V = Voltage of the X-ray tube
c = Speed of light
`therefore lambda = (1242 "eV"-"nm")/(e xx 30 xx 10^3)`
⇒ `lambda = 414 xx 10^-4 "nm" = 41.4 "pm"`
APPEARS IN
संबंधित प्रश्न
Identify the part of the electromagnetic spectrum which is:
produced by bombarding a metal target by high speed electrons.
To which part of electromagnetic spectrum does a wave of frequency 3 × 1013 Hz belong?
Give the range of wavelength of the electromagnetic waves visible to us.
What are ultraviolet radiations?
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.name the medium through which it is travelling
Can X-rays be used for photoelectric effect?
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 Kα and Kβ X-rays of molybdenum have wavelengths 0.71 A and 0.63 A respectively. Find the wavelength of Lα X-ray of molybdenum.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Write the range of the wavelength of the following electromagnetic radiations:
(a) Infrared rays
(b) Ultraviolet rays
(c) γ -rays
Write one use of each of the above.
Name the scientist who discovered Microwaves
-
- Calculate the speed of the wave.
- Name the medium through which it is traveling.
Name the radiation which can be detected by thermopile.
Identify the part of the electromagnetic spectrum used in
(i) radar and
(ii) eye surgery. Write their frequency range.
Gamma rays and radio waves travel with the same velocity in free space. Distinguish between them in terms of their origin and the main application.
Name two sources of infrared radiation.
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-
Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong?
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.
Name the electromagnetic radiation that has been used in obtaining the image below.
