WBJEE · Physics · Wave Optics
Two identical light waves, propagating in the same direction, have a phase difference \(\delta\). After they superpose the intensity of the resulting wave will be proportional to
- A \(\cos \delta\)
- B \(\cos (\delta / 2)\)
- C \(\cos ^2(\delta / 2)\)
- D \(\cos ^2 \delta\)
Answer & Solution
Correct Answer
(C) \(\cos ^2(\delta / 2)\)
Step-by-step Solution
Detailed explanation
\(I=4 I_0 \cos ^2\left(\frac{\delta}{2}\right) \Rightarrow I \propto \cos ^2\left(\frac{\delta}{2}\right)\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- \[
\text { The reading of the ammeter in the following figure will be }
\]
WBJEE 2010 Easy - Two mirrors at an angle \(\theta^{\circ}\) produce 5 images of a point. The number of images produced when \(\theta\) is decreased to \(\theta^{\circ}-30^{\circ}\) isWBJEE 2010 Medium
- Two particles have masses \(\mathrm{m} \& 4 \mathrm{~m}\) and their kinetic energies are in the ratio \(2: 1\). What is the ratio of their linear momenta?WBJEE 2009 Easy
- Ruma reached the metro station and found that the escalator was not working. She walked up the stationary escalator with velocity \(\mathrm{v}_1\) in time \(\mathrm{t}_1\). On other day if she remains stationary on the escalator moving with velocity \(\mathrm{v}_2\), then escalator takes her up in time \(t_2\). The time taken by her to walk up with velocity \(\mathrm{v}_1\) on the moving escalator will beWBJEE 2025 Medium
- Four capacitors of equal capacitance have an equivalent capacitance \(\mathrm{C}_1\) when connected in series and an equivalent capacitance \(\mathrm{C}_2\) when connected in parallel. The ratio \(\frac{\mathrm{C}_1}{\mathrm{C}_2}\) is:WBJEE 2009 Easy
- A bullet is fired with a velocity u making an angle of \(60^{\circ}\) with the horizontal plane. The horizontal component o the velocity of the bullet when it reaches the maximum height isWBJEE 2009 Medium
More PYQs from WBJEE
- Twenty metres of wire is available to fence off a flower bed in the form of a circular sector. What must the radius of the circle be, if the area of the flower bed be greatest?WBJEE 2022 Easy
- Let \(\vec{a}, \vec{b}\) and \(\vec{c}\) be vectors of equal magnitude such that the angle between \(\vec{a}\) and \(\vec{b}\) is \(\alpha, \vec{b}\) and \(\vec{c}\) is \(\beta\) and \(\vec{c}\) and \(\vec{a}\) is \(\gamma\). Then the minimum value of \(\cos \alpha+\cos \beta+\cos \gamma\) isWBJEE 2025 Medium
- Two cells \(A\) and \(B\) of emf \(2 \mathrm{V}\) and \(1.5 \mathrm{V}\) respectively, are connected as shown in figure through an external resistance \(10 \Omega\) The internal resistance of each cell is \(5 \Omega\). The potential difference \(E_{A}\) and \(E_{B}\) across the terminals of the cells \(A\) and \(B\) respectively are
WBJEE 2015 Medium - The co-ordinates of the focus of the parabola described parametrically by \(x=5 t^2+2, y=10 t+4\) areWBJEE 2009 Hard
- Let \([x]\) denotes the greatest integer less than or equal to \(x\). Then, the value of \(\alpha\) for which the function \(f(x)=\left\{\begin{array}{c}\frac{\sin \left[-x^{2}\right]}{\left[-x^{2}\right]}, x \neq 0 \\ \alpha, \quad x=0\end{array}\right.\) is continuous at \(x=0,\) isWBJEE 2015 Easy
- The maximum value of \(|x|\), when the complex number \(z\) satisfies the condition \(\left|z+\frac{2}{z}\right|=2\) isWBJEE 2012 Hard