English

Answer briefly. Give two uses of radio waves. - Physics

Advertisements
Advertisements

Question

Answer briefly.

Give two uses of radio waves.

Short Note

Solution

  1. Radio waves are used for wireless communication purposes.
  2. They are used for radio broadcasting and transmission of TV signals.
  3. Cellular phones use radio waves to transmit voice communication in the ultra-high frequency (UHF) band.
shaalaa.com
  Is there an error in this question or solution?
Chapter 13: Electromagnetic Waves and Communication System - Exercises [Page 241]

APPEARS IN

Balbharati Physics [English] 11 Standard Maharashtra State Board
Chapter 13 Electromagnetic Waves and Communication System
Exercises | Q 2. (ix) | Page 241

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

Use the formula λm T= 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?


Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?


Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals


State an additional use of the X-rays waves


What do you understand by the statement, "Electromagnetic waves transport momentum"?


Arrange the following radiations in the order of their increasing wavelength:

X-rays, infrared rays, ratio waves, gamma ray and microwaves.


Give one use of ultraviolet radiation.


Give one use of gamma rays.


In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?


Can X-rays be used for photoelectric effect?


Can Lα X-ray of one material have shorter wavelength than Kα X-ray of another?


An X-ray beam can be deflected


The energy of a photon of a characteristic X-ray from a Coolidge tube comes from


The X-ray beam emerging from an X-ray tube


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


Mark the correct options.
(a) An atom with a vacancy has smaller energy that a neutral atom.
(b) K X-ray is emitted when a hole makes a jump from the K shell to some other shell.
(c) The wavelength of K X-ray is smaller than the wavelength of L X-ray of the same material.
(d) The wavelength of Kα X-ray is smaller than the wavelength of Kβ X-ray of the same material.


The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,
(a) the intensity increases
(b) the minimum wavelength increases
(c) the intensity remains unchanged
(d) the minimum wavelength decreases.


The Kα and Kβ X-rays of molybdenum have wavelengths 0.71 A and 0.63 A respectively. Find the wavelength of Lα X-ray of molybdenum.

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)


What is the cause of dispersion?

Name the scientist who discovered
 X-rays


Name the scientist who discovered Visible light


Name the scientist who discovered Infra-red waves


What are ultraviolet radiations? How are they detected? State two properties and one use of ultraviolet radiations.

Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.


Define the term "Intensity" in the photon picture of electromagnetic radiation. 


Name the radiation of the electromagnetic spectrum which is used for the following:

Radar and Give the frequency range.


Give one use of electromagnetic radiation in Microwaves.


Choose the correct option.

The EM wave emitted by the Sun and responsible for heating the Earth’s atmosphere due to greenhouse effect is


Answer briefly.

Why light waves travel in a vacuum whereas sound waves cannot?


Microwaves are electromagnetic waves with frequency in the range of.


Following QN ∴ 14, the radiation force on the roof will be


What is time period of the light for which the eye is most sensitive?


One requires 11eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in ______.


Why does microwave oven heats up a food item containing water molecules most efficiently?


The magnetic field of a beam emerging from a filter facing a floodlight is given by B0 = 12 × 10–8 sin (1.20 × 107z – 3.60 × 1015t) T. What is the average intensity of the beam?


Write two uses of the following radiation.

Gamma rays


In uranium (Z = 92) the K absorption edge is 0.107 Å and the Kα line is 0.126 Å, and the wavelength of the L absorption edge is ______.


Identify the electromagnetic wave whose wavelength range is from about 10-12 m to about 10-8 m. Write one use of this.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×