Question:
A car moves with a speed of $54 \mathrm{~km} \mathrm{~h}^{-1}$ towards a cliff. The horn of the car emits sound of frequency $400 \mathrm{~Hz}$ at a speed of $335 \mathrm{~m} \mathrm{~s}^{-1}$.
(a) Find the wavelength of the sound emitted by the horn in front of the car.
(b) Find the wavelength of the wave reflected from the cliff.
(c) What frequency does a person sitting in the car hear for the reflected sound wave?
(d) How many beats does he hear in 10 seconds between the sound coming directly from the horn and that coming after the reflection?
Solution:
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- Wave on String
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- Electromagnetic Induction
- Atomic Structure
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- Motion in a Plane
- Law of Motion
- Work, Energy and Power
- Systems of Particles and Rotational Motion
- Gravitation
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- Oscillations
- Waves
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- Electrostatic Potential and Capacitance
- Current Electricity
- Thermoelectric Effects of Electric Current
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- Magnetism and Matter
- Electromagnetic Induction
- Alternating Current
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All Study Material
- JEE Main
- Exam Pattern
- Previous Year Papers
- PYQ Chapterwise
- Physics
- Kinematics 1D
- Kinemetics 2D
- Friction
- Work, Power, Energy
- Centre of Mass and Collision
- Rotational Dynamics
- Gravitation
- Calorimetry
- Elasticity
- Thermal Expansion
- Heat Transfer
- Kinetic Theory of Gases
- Thermodynamics
- Simple Harmonic Motion
- Wave on String
- Sound waves
- Fluid Mechanics
- Electrostatics
- Current Electricity
- Capacitor
- Magnetism and Matter
- Electromagnetic Induction
- Atomic Structure
- Dual Nature of Matter
- Nuclear Physics
- Radioactivity
- Semiconductors
- Communication System
- Error in Measurement & instruments
- Alternating Current
- Electromagnetic Waves
- Wave Optics
- X-Rays
- All Subjects
- Physics
- Motion in a Plane
- Law of Motion
- Work, Energy and Power
- Systems of Particles and Rotational Motion
- Gravitation
- Mechanical Properties of Solids
- Mechanical Properties of Fluids
- Thermal Properties of matter
- Thermodynamics
- Kinetic Theory
- Oscillations
- Waves
- Electric Charge and Fields
- Electrostatic Potential and Capacitance
- Current Electricity
- Thermoelectric Effects of Electric Current
- Heating Effects of Electric Current
- Moving Charges and Magnetism
- Magnetism and Matter
- Electromagnetic Induction
- Alternating Current
- Electromagnetic Wave
- Ray Optics and Optical Instruments
- Wave Optics
- Dual Nature of Radiation and Matter
- Atoms
- Nuclei
- Semiconductor Electronics: Materials, Devices and Simple Circuits.
- Chemical Effects of Electric Current,
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