JEE Mains · Physics · STD 11 - 14. waves and sound
A person standing on an open ground hears the sound of a jet aeroplane, coming from north at an angle \(60^o\) with ground level. But he finds the aeroplane right vertically above his position. If \(\upsilon \) is the speed of sound, speed of the plane is
- A \(\frac{{\sqrt 3 }}{2}\upsilon \)
- B \(\frac{{2\upsilon }}{{\sqrt 3 }}\)
- C \(\upsilon \)
- D \(\frac{\upsilon }{2}\)
Answer & Solution
Correct Answer
(D) \(\frac{\upsilon }{2}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{V}_{\mathrm{P}} \rightarrow\) Speed of plane \(\vee \rightarrow\) Speed of sound \(\vee \cos 60^{\circ}=V_{P}\) \(V_{P}=\frac{V}{2}\)
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
- A particle of charge \(-q\) and mass \(m\) moves in a circle of radius \(r\) around an infinitely long line charge of linear density \(+\lambda\). Then time period will be given as _______. (Consider \(k\) as Coulomb's constant)JEE Mains 2024 Hard
- Given below are two statements : One is labelled as Assertion \(A\) and the other is labelled as Reason \(R\). Assertion \(A\) : \(n - p - n\) transistor permits more current than a \(p-n-p\) transistor Reason \(R\) : Electrons have greater mobility as a charge carrier Choose the correct answer from the options given belowJEE Mains 2022 Medium
- Two long parallel wires carrying currents \(8\,A\) and \(15\,A\) in opposite directions are placed at a distance of \(7\,cm\) from each other. A point \(P\) is at equidistant from both the wires such that the lines joining the point \(P\) to the wires are perpendicular to each other. The magnitude of magnetic field at \(P\) is \(............\times 10^{-6}\,T\). (Given : \(\left.\sqrt{2}=1.4\right)\)JEE Mains 2023 Hard
- A curved in a level road has a radius \(75\, m\). The maximum speed of a car turning this curved road can be \(30 \,m / s\) without skidding. If radius of curved road is changed to \(48\, m\) and the coefficient of friction between the tyres and the road remains same, then maximum allowed speed would be .........\(m / s\).JEE Mains 2022 Medium
- An electron of mass \(m\) is moving in an electric field \(\vec{E} = -2E_0\hat{i}\) (\(E_0 =\) constant \(> 0\)), with an initial velocity \(\vec{V} = v_0\hat{i}\) (\(v_0 =\) constant \(> 0\)). If \(\lambda_0 = \dfrac{h}{4mv_0}\), its de Broglie wavelength at time \(t\) is __________.
(\(e =\) charge of electron)JEE Mains 2026 Hard - Electric charge is transferred to an irregular metallic disk as shown in figure. If \(\sigma_1, \sigma_2, \sigma_3\) and \(\sigma_4\) are charge densities at given points then, choose the correct answer from the options given below:
JEE Mains 2025 Medium
More PYQs from JEE Mains
- The probability that a randomly chosen one-one function from the set \(\{a, b, c, d\}\) to the set \(\{1,2,3,4,5\}\) satisfies \(f(a)+2 f(b)-f(c)=f(d)\) isJEE Mains 2022 Hard
- Let \(y=y(x)\) be the solution of the differential equation \(\left(3 y^2-5 x^2\right) y d x+2 x\left(x^2-y^2\right) d y=0\) such that \(y(1)=1\). then \(\left|(y(2))^3-12 y(2)\right|\) is equal to:JEE Mains 2023 Hard
- Two different adiabatic paths for the same gas intersect two isothermal curves as shown in\(P-V\) diagram. The relation between the ratio \(\frac{V_a}{V_d}\) and the ratio \(\frac{V_b}{V_c}\) is _______.
JEE Mains 2024 Hard - The shortest distance between the line \(y = x\) and the curve \(y^2 = x - 2\) isJEE Mains 2019 Hard
- A standing wave is formed by the superposition of two waves travelling in opposite directions. The transverse displacement is given by \(y\left( {x,t} \right) = 0.5\sin\, \left( {\frac{{5\pi }}{4}x} \right)\,\cos\, \left( {200\,\pi t} \right)\). What is the speed of the travelling wave moving in the positive \(x\) direction .... \(m/s\) ? (\(x\) and \(t\) are in meter and second, respectively.)JEE Mains 2017 Hard
- A vector \(\vec{a}\) is parallel to the line of intersection of the plane determined by the vectors \(\hat{i}, \hat{i}+\hat{j}\) and the plane determined by the vectors \(\hat{i}-\hat{j}, \hat{i}+\hat{k}\). The obtuse angle between \(\vec{a}\) and the vector \(\vec{b}=\hat{i}-2 \hat{j}+2 \hat{k}\) isJEE Mains 2022 Hard