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State the approximate range of wavelength associated with visible light. - Physics

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प्रश्न

State the approximate range of wavelength associated with visible light.

एका वाक्यात उत्तर

उत्तर

Visible light wavelength range 4000 Å to 8000 Å.

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पाठ 6: Spectrum - Exercise 6 (B) 1 [पृष्ठ १४४]

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सेलिना Physics [English] Class 10 ICSE
पाठ 6 Spectrum
Exercise 6 (B) 1 | Q 12.2 | पृष्ठ १४४

संबंधित प्रश्‍न

Name the parts of the electromagnetic spectrum which is

used as a diagnostic tool in medicine.

Write in brief, how these waves can be produced.


What is the range of the wavelength of the following electromagnetic waves?

(a) Visible. 


Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.


50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be


X-ray from a Coolidge tube is incident on a thin aluminium foil. The intensity of the X-ray transmitted by the foil is found to be I0. The heating current is increased to increase the temperature of the filament. The intensity of the X-ray transmitted by the foil will be
(a) zero
(b) < I0
(c) I0
(d) > I0


Suppose a monochromatic X-ray beam of wavelength 100 pm is sent through a Young's double slit and the interference pattern is observed on a photographic plate placed 40 cm away from the slit. What should be the separation between the slits so that the successive maxima on the screen are separated by a distance of 0.1 mm?


Name the radiation which can be detected by thermopile.


Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J.


The half-value thickness of an absorber is defined as the thickness that will reduce exponentially the intensity of a beam of particles by a factor of 2. The half-value thickness in (µm) for lead assuming X-ray beam of wavelength 20 pm, µ = 50 cm-1 for X-rays in lead at wavelength λ = 20 pm, is ______ µm.


In an atom X, electrons absorb the energy from an external source. This energy “excites” the electrons from a lower-energy level to a higher-energy level around the nucleus of the atom. When electrons return to the ground state, they emit photons.

The figure below is the energy level diagram of atom X with three energy levels, E1 = 0.00eV, E2 = 1.78eV and E3 = 2.95eV. The ground state is considered 0 eV for reference. The transition of electrons takes place between levels E1 and E2.

  1. What wavelength of radiation is needed to excite the atom to energy level E2 from E1?
  2. Suppose the external source has a power of 100 W. What would be the rate of photon emission?

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