Search any question & find its solution
Question:
Answered & Verified by Expert
A parallel beam of light is incident on a tank filled with water up to a height of $61.5 \mathrm{~mm}$ as shown in the figure below. Ultrasonic waves of frequency $0.5 \mathrm{MHz}$ are sent along the length of the water column using a transducer placed at the top, and they form longitudinal standing waves in the water. Which of the schematic plots below best describes the intensity distribution of the light as seen on the screen? Take the speed of sound in water to be $1,500 \mathrm{~m} / \mathrm{s} .$
Options:
- A
- B
- C
- D
Solution:
1176 Upvotes
Verified Answer
The correct answer is:
$\mathrm{v}=v \lambda$
$\Rightarrow \lambda=\frac{1500}{0.5 \times 10^{6}}=3000 \times 10^{-6}$
$\lambda=3 \mathrm{~mm}$
intensity vary according to graph ' $\mathrm{A}$ '
$\Rightarrow \lambda=\frac{1500}{0.5 \times 10^{6}}=3000 \times 10^{-6}$
$\lambda=3 \mathrm{~mm}$
intensity vary according to graph ' $\mathrm{A}$ '
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.