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संबंधित प्रश्न
If the earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E = hv (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?
Why are infra-red waves often called heat waves? Explain.
Name the radiations of wavelength just longer than 8 × 10-7m.
If the current in the circuit for heating the filament is increased, the cutoff wavelength
| Gamma rays | D | C | Visible light | B | A |
The above table shows different parts of the electromagnetic spectrum.
(a) Identify the parts of the spectrum marked as A, B, C and D.
(b) Which of the radiations A or B has the higher frequency?
(c) State two properties which are common to all parts of the electromagnetic spectrum.
(d) Name one source of each of the radiation of electromagnetic spectrum.
(e) Name one detector for each of the radiation.
(f) Name one use of each of the radiation.
Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
If λv, λx and λm Am represents the wavelength of visible light, x-ray and microwaves respectively, then ______.
The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is ______.
What is the speed of radio waves in vacuum?
