Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

two towers on top of hills are 40 km apart . the line joining them passes 50 m above a hill halfway
between the tower .what is the largest wavelength of radio waves ,what is the larges wavelength of radio waves ,which can be sent between the towers without appreciable diffraction effects
Asked by vinodjoshi112233 | 07 Dec, 2017, 08:40: PM
answered-by-expert Expert Answer
Answer to the problem is to find out the path difference between the direct transmission path ( PSQ) and the reflected transmission path(PRQ).
 
The path difference can be calculated as 125 cm.
To avoid diffraction effect it is required to have constructive interference between the direct radio wave and the reflected radio wave at Q.
For this, the path difference should be nλ, where n is integers and λ is wavelength of raido wave transmitted.
 
Hence λ of radio wave should be integer multiple of 125 cm
Answered by | 08 Dec, 2017, 12:33: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
Please answer below question from 2023 board paper:  
question image
Asked by prachis14 | 06 Mar, 2023, 04:49: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
A parallel beam of light of wavelength 600 nm is incident normally on a slit of width 0.2 mm. If the resulting diffraction pattern is observed on a screen 1 m away, find the distance of (i) First minimum, and (ii) Second maximum, from the central maximum. 
Asked by suman.sh01 | 21 May, 2022, 11:09: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Please refer to the uploaded image for the doubt
question image
Asked by arjunsah797 | 14 May, 2022, 01:34: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Two stars distant two light years are just resolved by a telescope. The diameter of the telescope lens is 0.25 m. If the wavelength of light used in 5000A0, then the minimum distance between the stars is
Asked by sirib942254 | 04 Aug, 2021, 08:30: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Physics 
question image
Asked by ramdasiyogesh2001 | 12 Mar, 2021, 12:47: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
three identical polaroids P1 P2 and P3 are oriented so that passes axis of P2 and P3 are incline at angle of 60° 90° effectively with the passes access a monochromatic source S and police light of intensity I note is kept in front of the proceeds p.m. as shown in figure determine the intensity of light is observed by the observed when polyps P3 is rotated with respect to P2 at angle theta
Asked by dsdeepak487 | 27 Feb, 2020, 06:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Two polarizers are placed at crossed position (i.e. having an angle of 90 between them ), a third polarizer making an angle  with the first one is placed between them. An unpolarized light of intensity I0 is incident on the first oneand passes through all the three polarizers. Find the light intensity of the emergent beam.
Asked by Abhineet | 26 Nov, 2019, 02:04: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
A parallel beam of light of wavelength 5900 Å falls normally on a plane transmission grating having 4250 lines/cm. Find the angle of diffraction for maximum intensity in first order.
Asked by Abhineet | 26 Nov, 2019, 02:03: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Explain diffraction of light due to single slit ,derive secondary Maxima and minima?
Asked by vanshrathod71 | 30 Jan, 2019, 12:38: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Why does light appear to travel in a straight line in spite of its wave nature?
Asked by Topperlearning User | 13 Jun, 2014, 07:29: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×