What is echo?

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In acoustics, an echo is a reflection of sound waves off a surface back to the listener after a delay of a few seconds or more.

Echo is the reflection of sound reaching the listener after some time.
It often creates a repetitive, distorted, and sometimes amplified effect.
It can occur naturally in environments with hard surfaces or be deliberately created for artistic or communication purposes using specialized equipment.

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Related Topics
Difference between Echo and Reverberation	Reflection of Waves	Types of Waves
Transversal and Longitudinal Waves	Laws of Reflection	Unit of Vibration
Resonance	Loudness of Sound	Frequency and Wavelength

CBSE CLASS XII Related Questions

1.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.
2.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?
- The total charge of the two spheres is conserved.
- Both spheres attain the same potential.
- The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2)}{(r_1 + r_2)}$
- The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2) (r_1 + r_2)}{r_1 r_2}$
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3.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.
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4.
Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.
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5.
Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.
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6.
Read the following paragraph and answer the questions that follow.
A p-type or n-type semiconductor can be converted into a p-n junction by doping it with suitable impurity. The motion of majority charge carriers causes diffusion current across the junction while the barrier electric field causes motion of minority carriers for drift current. In case of unbiased diode, the diffusion and drift currents are equal. This equilibrium is disturbed by the biasing batteries. Diodes, therefore, allow currents in one direction. This property of diode is used in making rectifiers.