मराठी

Two waves A and B have wavelength 0.01 Å and 9000 Å respectively. a. Name the two waves. b. Compare the speeds of these waves when they travel in vacuum. - Physics

Advertisements
Advertisements

प्रश्न

Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.

  1. Name the two waves.
  2. Compare the speeds of these waves when they travel in vacuum.
एका वाक्यात उत्तर

उत्तर

  1. A - gamma rays, B - infrared radiation.
  2. The ratio of the speeds of these waves in a vacuum is 1:1, as all electromagnetic waves travel at the speed of light in a vacuum.
shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 6: Spectrum - Exercise 6 (B) 1 [पृष्ठ १४४]

APPEARS IN

सेलिना Physics [English] Class 10 ICSE
पाठ 6 Spectrum
Exercise 6 (B) 1 | Q 17 | पृष्ठ १४४

संबंधित प्रश्‍न

To which part of electromagnetic spectrum does a wave of frequency 3 × 1013 Hz belong?


Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.

(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).

(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).

(c) 2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe].

(d) 5890 Å - 5896 Å [double lines of sodium]

(e) 14.4 keV [energy of a particular transition in 57Fe nucleus associated with a famous high resolution spectroscopic method (Mössbauer spectroscopy)].


Name the waves produced by the changes in the nucleus of an atom.


If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength


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


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.)


Name the scientist who discovered Microwaves 


Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.


Answer briefly.

Give two uses of ultraviolet rays.


What is the wavelength range of electromagnetic radiation used in radio broadcast?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×
Our website is made possible by ad-free subscriptions or displaying online advertisements to our visitors.
If you don't like ads you can support us by buying an ad-free subscription or please consider supporting us by disabling your ad blocker. Thank you.