English

Calculate the wavelength of a microwave of a frequency of 8.0 GHz.

Advertisements
Advertisements

Question

Calculate the wavelength of a microwave of a frequency of 8.0 GHz.

Numerical
Advertisements

Solution

Given: ν = 8 GHz = 8 × 109 Hz, c = 3 × 108 m/s

To find: Wavelength (λ)

Formula: c = νλ

Calculation: From formula,

λ = `"c"/ν`

= `(3xx10^8)/(8xx10^9)`

= 3.75 × 10−2

= 3.75 cm

The wavelength of microwave is 3.75 cm.

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] Standard 11 Maharashtra State Board
Chapter 13 Electromagnetic Waves and Communication System
Exercises | Q 3. (iv) | Page 241

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.


What physical quantity is the same for X-rays of wavelength 10−10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500 m?


A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?


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?


Why are infra-red waves often called heat waves? Explain.


Which radiation is used for satellite communication?


What is the range of the wavelength of the following electromagnetic waves?
(a) Gamma rays.


Give one use of gamma rays.


Name three properties of ultraviolet radiations which are similar to visible light.


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


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.


Consider a photon of continuous X-ray and a photon of characteristic X-ray of the same wavelength. Which of the following is/are different for the two photons?


The X-ray coming from a Coolidge tube has a cutoff wavelength of 80 pm. Find the kinetic energy of the electrons hitting the target.

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


The short-wavelength limit shifts by 26 pm when the operating voltage in an X-ray tube is increased to 1.5 times the original value. What was the original value of the operating voltage?

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


The electron beam in a colour TV is accelerated through 32 kV and then strikes the screen. What is the wavelength of the most energetic X-ray photon?

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


A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 × 10−26 kg.

(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 velocity of electromagnetic wave?

Name the scientist who discovered
 X-rays


Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.


What are the ultraviolet rays?


Name the e.m. waves which are suitable for radar systems used in aircraft navigation. Write the range of frequency of these waves.


The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-


The ozone layer absorbs


The frequency of e. m waves which is best suited .to observed of radius 3 × 10–4 his of the order of


SONAR emits which of the following waves?


Electromagnetic waves with wavelength

  1. λ1 is used in satellite communication.
  2. λ2 is used to kill germs in water purifies.
  3. λ3 is used to detect leakage of oil in underground pipelines.
  4. λ4 is used to improve visibility in runways during fog and mist conditions.
  1. Identify and name the part of electromagnetic spectrum to which these radiations belong.
  2. Arrange these wavelengths in ascending order of their magnitude.
  3. Write one more application of each.

Identify the part of the electromagnetic spectrum which:

  1. produces the heating effect.
  2. is absorbed by the ozone layer in the atmosphere.
  3. is used for studying crystal structure.

Write any one method of the production of each of the above radiations.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×