Advertisements
Advertisements
प्रश्न
Mention the two features of x-ray spectra, not explained by classical electromagnetic theory.
उत्तर
Though classical electromagnetic theory suggests the emission of radiations from accelerating electrons, it could not explain two features exhibited by x-ray spectra. These features are given below
- For a given accelerating voltage, the lower limit for the wavelength of continuous x-ray spectra is the same for all targets. This minimum wavelength is called cut-off wavelength.
- The intensity of x-rays is significantly increased at certain well-defined wavelengths as shown in the case of characteristic x-ray spectra for molybdenum.
APPEARS IN
संबंधित प्रश्न
The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is __________.
Photons of wavelength λ are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic field having magnitude B. The work function of the metal is
What is the photoelectric effect?
How will you define threshold frequency?
What is a photocell?
Briefly discuss the observations of Hertz, Hallwachs and Lenard.
List out the laws of photoelectric effect.
Obtain Einstein’s photoelectric equation with the necessary explanation.
Explain experimentally observed facts of the photoelectric effect with the help of Einstein’s explanation.
At the given point of time, the earth receives energy from the sun at 4 cal cm–2 min–1. Determine the number of photons received on the surface of the Earth per cm2 per minute. (Given: Mean wavelength of sunlight = 5500 Å)
