Advertisements
Advertisements
प्रश्न
Name two sources, each of infrared radiations and ultraviolet radiations.
Advertisements
उत्तर
- All heated bodies, such as a heated iron ball, flame, fire, etc., are sources of infrared radiation.
- The electric arc and sparks give ultraviolet radiation.
APPEARS IN
संबंधित प्रश्न
What role dose infra-red radiation play in physical therapy?
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?
State the approximate range of wavelength associated with infrared rays.
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.)
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.
Answer briefly.
What are radio waves?
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:
All components of the electromagnetic spectrum in a vacuum have the same ______
Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong?
