Two towers on top of two hills are 40 km...

Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects?

Text Solution

Verified by Experts

12.5 cm

Topper's Solved these Questions

WAVE OPTICS
NCERT BANGLISH|Exercise EXERCISES|26 Videos
SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS
NCERT BANGLISH|Exercise ADDITIONAL EXERCISES|6 Videos

Similar Questions

Explore conceptually related problems

The wavelength of a travelling wave is 2 m. What is the phase difference between two particles 1 m apart.in the path of the wave.

To a person standing at the middle point of the horizontal straight line joining the feet of two vertical posts of the same height, the angle of elevation of the top of each post appears to be 30^@ . After walking 40metres towards one of them , the person observes that the angle of elevation of the top of the same post has changed to 60^@ . Find the distance between the two posts.

Two towers are situated at a distance of 150 metre and the height of one is 3 time the height of the other. From the mid point of the line joining the bottom of them the angles of elevation of the top of two towers are complementary,. Find the heights of two towers

Two towers are situated at a distance of 120sqrt2 metre and the height of one is twice the height of other. From the mid point of the line joining the bottom of them the angle of elevaion of the top of two towers are complementary. Find the heights two towers.

Two men standing on either side of a tower 60m high observe the angle of elevation of the top of the tower is to be 45^@ and 60^@ respectively. Find the distance between two men.

Two flagstaffs stand on a horizontal plane. A and B are two points on the line joining their feet and between them. The angles of elevation of the tops of the flagstaffs as seen from A are 30^@ and 60^@ and as seen from B are 60^@ and 45^@ . If AB is 30 m, then the distance between the flagstaffs is

The radius of curvature of a railway track at a bend is 500 m. The distance between the two tracks is 1 m and the outer line is 4 cm higher than the inner. At what maximum speed can a train bend round the curve without exerting lateral pressure on the outer line?

The angular elevations of the top of a tower from two points in the same horizontal line with its foot and observed to be theta and phi respectively. Find the distance between the two points of observation, if the height of the tower is h.

A+250 esu of charge P is On the line joining other two charges Q ( +50 esu of charge ) and R(-300 esu of charge) in between them. Distance of P from Q is 5 cm and from R it is 10 cm. What the resultant force acting on P? (##CHY_DMB_PHY_XII_P1_U01_C02_SLV_006_Q01.png" width="80%">

NCERT BANGLISH-WAVE OPTICS-EXERCISES

In a double-slit experiment the angular width of a fringe is found to ...
Text Solution
|
What is the Brewster angle for air to glass transition? (Refractive in...
Text Solution
|
Light of wavelength 5000 Å falls on a plane reflecting surface. What a...
Text Solution
|
Estimate the distance for which ray optics is good approximation for a...
Text Solution
|
The 6563Å Halpha line emitted by hydrogen in a star is found to be red...
Text Solution
|
Explain how Corpuscular theory predicts the speed of light in a medium...
Text Solution
|
You have learnt in the text how Huygens’ principle leads to the laws o...
Text Solution
|
Let us list some of the factors, which could possibly influence the sp...
Text Solution
|
For sound waves, the Doppler formula for frequency shift differs sligh...
Text Solution
|
In double-slit experiment using light of wavelength 600 nm, the angula...
Text Solution
|
Answer the following questions: (a) In a single slit diffraction exp...
Text Solution
|
Answer the following questions: (b) In what way is diffraction from ...
Text Solution
|
Answer the following questions: (c) When a tiny circular obstacle is...
Text Solution
|
Answer the following questions: (d) Two students are separated by a ...
Text Solution
|
Answer the following questions: (e) Ray optics is based on the assum...
Text Solution
|
Two towers on top of two hills are 40 km apart. The line joining them ...
Text Solution
|
A parallel beam of light of wavelength 500 nm falls on a narrow slit a...
Text Solution
|
Answer the following questions: (a) When a low flying aircraft passe...
Text Solution
|
Answer the following questions: (b) As you have learnt in the text, ...
Text Solution
|
In deriving the single slit diffraction pattern, it was stated that th...
Text Solution
|