Advertisements
Advertisements
प्रश्न
Choose the correct option.
How does the frequency of a beam of ultraviolet light change when it travels from air into glass?
पर्याय
depends on the values of μ and ε
increases
decreases
remains same
Advertisements
उत्तर
remains same
APPEARS IN
संबंधित प्रश्न
Why are microwaves considered suitable for radar systems used in aircraft navigation?
Identify the part of the electromagnetic spectrum which is:
produced by bombarding a metal target by high speed electrons.
What physical quantity is the same for X-rays of wavelength 10−10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500 m?
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?
Name the phenomenon which shows the quantum nature of electromagnetic radiation.
Name the region beyond the red end of the spectrum.
State the approximate range of wavelength associated with the ultraviolet rays.
Name the radiations of wavelength just longer than 8 × 10-7m.
Give one use of gamma rays.
Name the rays or waves of highest frequency .
Name two sources, each of infrared radiations and ultraviolet radiations.
Can X-rays be polarised?
Can a hydrogen atom emit characteristic X-rays?
50% of the X-rays coming from a Coolidge tube are able to pass through a 0.1 mm thick aluminium foil. If the potential difference between the target and the filament is increased, the fraction of the X-rays passing through the same foil will be
The Kβ X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.
A certain element emits Kα X-ray of energy 3.69 keV. Use the data from the previous problem to identify the element.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
The Kα X-rays of aluminium (Z = 13) and zinc (Z = 30) have wavelengths 887 pm and 146 pm respectively. Use Moseley's law √v = a(Z − b) to find the wavelengths of the Kα X-ray of iron (Z = 26).
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
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.
The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of Kα, Kβ and Lα X-rays of silver.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 × 10−26 kg.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
How will you investigate the existence of the radiation beyond the red and violet extremes of the spectrum?
Give one use of electromagnetic radiation in Microwaves.
Answer briefly.
Why are microwaves used in radar?
Answer briefly.
Does an ordinary electric lamp emit EM waves?
Radio waves of constant amplitude can be generated with.
The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is ______.
What is the speed of radio waves in vacuum?
Name the electromagnetic radiation that has been used in obtaining the image below.
