Question 167: Waves

Question

Three harmonic waves having equal frequency
$$
u $$ and same intensity $${I_0}$$, have phase angles 0, $${\pi  \over 4}$$ and $$ - {\pi  \over 4}$$ respectively. When they are
superimposed the intensity of the resultant wave
is close to :

Accepted Answer

I
0
= CA
2
A
R
= A  + A$$\sqrt 2 $$ = A(1 + $$\sqrt 2 $$)
I
R
= C$$A_R^2$$
$$ 	herefore $$ I
R
= CA
2
$${\left( {\sqrt 2  + 1} ight)^2}$$ = 5.8 I
0

Answer

5.8 I0

Answer

3 I0

Answer

0.2 I0

Answer

I0

Waves

Three harmonic waves having equal frequency $\nu and same intensity {I_0}, have phase angles 0, {\pi \over 4} and - {\pi \over 4}$ respectively. When they are superimposed the intensity of the resultant wave is close to :

Choose the correct answer: