WavesNEET Physics · Class 11 · NCERT Chapter 14

The wave $y=A\sin (\omega t-kx)$ travels in the:

The relation between angular frequency $\omega$, wave number $k$, and wave speed $v$ is:

The speed of a transverse wave on a stretched string of tension $T$ and linear mass density $\mu$ is:

The fundamental frequency of a string of length $L$ fixed at both ends with wave speed $v$ is:

A pipe closed at one end has fundamental frequency 256 Hz. Its second overtone (third harmonic, since only odd harmonics) is at:

Two tuning forks of frequencies 504 Hz and 510 Hz are sounded together. The number of beats per second is:

A stationary observer hears a 500 Hz tone from a source approaching at 30 m/s. Take $v_{\text{sound}}=330\text{m/s}$. The observed frequency is:

An open pipe of length $L$ has fundamental frequency $f_1$. A closed pipe (one end closed) of length $L$ has fundamental frequency:

If the tension in a string is increased by a factor of 4, the wave speed:

A wave $y=5\sin (2\pi t-0.5\pi x)$ (in SI units) has wavelength:

The speed of sound in a gas of pressure $P$, density $\rho$ and adiabatic ratio $\gamma$ is:

Two strings of fundamental frequencies 250 Hz and 256 Hz are sounded together. The number of beats per second is:

A source emits sound at frequency 800 Hz. An observer moves towards the (stationary) source at 30 m/s. Take $v=330\text{m/s}$. Observed frequency:

A string of length 0.5 m under tension 200 N has linear density 0.005 kg/m. Its fundamental frequency is:

Two waves of equal amplitude $A$ and frequency travel in opposite directions, superposing to form a standing wave. The amplitude of the antinodes is:

In an open organ pipe, the harmonics present are:

In a closed (one end) organ pipe, the harmonics present are:

Two strings of equal lengths but different tensions $T_1=T$ and $T_2=4T$ have their wave speeds in the ratio:

A whistle of frequency 1000 Hz moves away from a stationary observer at 30 m/s. Take $v=330\text{m/s}$. The observed frequency is:

If $y=0.05\sin (40\pi t-0.5\pi x)$ (SI units), the wave speed is:

A tuning fork A produces 5 beats per second when sounded with a fork B of frequency 256 Hz. When A is loaded with wax, beat frequency drops to 2 per second. Frequency of A is:

A string vibrates in n loops in its $n$-th harmonic. The number of nodes (including endpoints) is:

Constructive interference between two waves occurs when their phase difference is:

Both source and observer approach each other, each at 20 m/s. Source frequency is 500 Hz; $v_{\text{sound}}=340\text{m/s}$. Observed frequency:

A string of length 1 m fixed at both ends has fundamental frequency 100 Hz. The third harmonic is at:

If the temperature of air rises from 27 °C to 127 °C (300 K to 400 K), the speed of sound increases by approximately:

A transverse wave moves on a string with $\lambda =0.4\text{m}$ and $f=50\text{Hz}$. Its speed is:

A closed pipe and an open pipe have the same fundamental frequency. The ratio of their lengths $L_{\text{closed}}:L_{\text{open}}$ is:

Two wires of the same material have radii $r$ and $2r$, equal lengths, and are stretched by the same tension. The ratio of wave speeds in them is:

Source and observer move in the same direction, observer ahead. Source at 20 m/s, observer at 20 m/s, both same direction. $f=500\text{Hz}$, $v=340\text{m/s}$. Observed frequency:

When a tuning fork of frequency 250 Hz is sounded with a fork of unknown frequency, 4 beats per second are heard. After loading the unknown fork with a small mass of wax, beats reduce to 2 per second. The original frequency of the unknown fork is:

The speed of sound in air at 0 °C is approximately: