Is the Calculation of a Radar Antenna's Height at 349 Meters Accurate?

AI Thread Summary
The discussion centers on the accuracy of a radar antenna's height calculation, specifically questioning whether the calculated height of 349 meters is correct. The problem involves a radar antenna on a cliff, operating at a wavelength of 400m, with reflections impacting the received signals. The original poster believes their solution, detailed in an attached PDF, is accurate despite their teacher's disagreement. Initial feedback suggests that the method and answer in the PDF appear valid. The poster seeks definitive opinions to support their challenge against the teacher's assessment.
kirpal_06391
Messages
3
Reaction score
0
Q. A radar antenna is located atop a high cliff on the edge of a lake operates at a wavelength of 400m. A parallel beam of electromagnetic wave is received by the antenna at E. One ray directly comes to E and other along the path ABE (after reflection at the water surface) the first minimum is recorded when the angle ABF = 35˚. Find the height of the cliff.

Solution has been attached as PDF file.

Now, my real question is, that whether my solution is correct or not, as my teacher has declared it incorrect but I have VERY STRONG feeling that its correct.

Answer given by my teacher is 349 meters.
 

Attachments

Physics news on Phys.org
Er.. opinions required before Monday
 
On a quick look, the method and answer in the pdf file seem fine.
 
Well I need either perfectly correct or incorrect type opinion b'coz I'm going to challenge my teacher on that basis
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Figure 1 Overall Structure Diagram Figure 2: Top view of the piston when it is cylindrical A circular opening is created at a height of 5 meters above the water surface. Inside this opening is a sleeve-type piston with a cross-sectional area of 1 square meter. The piston is pulled to the right at a constant speed. The pulling force is（Figure 2）： F = ρshg = 1000 × 1 × 5 × 10 = 50,000 N. Figure 3: Modifying the structure to incorporate a fixed internal piston When I modify the piston...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Calculating Height of Cliff Using Reflection Interference of Radio Waves
Replies
6
Views
6K
Debug help: optical laser interference setup fails to work
Replies
8
Views
2K
How Do You Calculate the Maximum Height of a Projectile Using Energy Concepts?
Replies
3
Views
12K

Hot Threads

Recent Insights

Back
Top