Question

4) 012
19. An electromagnetic wave emitted by source
travels 21 km to arrive at a receiver. The wave while
travelling in another path is reflected from a surface
at 19 km away and further travels 12 km to reach
the same receiver. If destructive interference occurs
at the receiving end, the maximum wavelength of
the wave is
1) 0.5 km
3) 5 km
2) 1 km
4) 10 km​

Answer 1

Answer:

Answer:1)0.5km..................