List of top Physics Questions on Wave characteristics

The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:

In single electron \(atom/ion\), first member of Lyman series is \(λ\), then wavelength of second member of their series shall be

Stopping potential is \(8\) \(V\) if wavelength of incident light is \(λ\) and it is \(2\) \(V\) for \(3λ\). Find threshold wavelength.

In an amplitude modulation, a modulating signal having amplitude of $X V$ is superimposed with a carrier signal of amplitude $Y V$ in first case Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude $2 YV$ The ratio of modulation index in the two cases respectively will be :s

We do not transmit low frequency signal to long distance because-
(a) The size of the antenna should be comparable to signal wavelength which is unreal solution for a signal of longer wavelength
(b) Effective power radiated by a long wavelength baseband signal would be high
(c) We want to avoid mixing up signals transmitted by different transmitter simultaneously
(d) Low frequency signal can be sent to long distances by superimposing with a high frequency wave as well
Therefore, the most suitable option will be

Amplitude modulated wave is represented by V_AM = 10[1+0.4cos(2π×10⁴t] cos(2π×10⁷t). The total bandwidth of the amplitude modulated wave is:

If a wave gets refracted into a denser medium, then which of the following is true?

Choose the correct statement for amplitude modulation :

An antenna is placed in a dielectric medium of dielectric constant \(6.25\). If the maximum size of that antenna is \(5.0\) \(mm\), it can radiate a signal of minimum frequency of __________GHz. (Given \(μr\) = \(1\) for dielectric medium)

The graph which shows the variation of the de Broglie wavelength (λ) of a particle and its associated momentum (p) is

A wave along a string has the following equation $y = 0.05 \sin (28t - 1.78x)\, m$ (where t is in seconds and x is in meters). What are the amplitude, (A) frequency (f) and wavelength $(\lambda)$ of the wave?

Loudness of sound depends on

If a 46 gm golf ball has velocity 36 m/s and an electron with velocity 107 m/s. Which of these two show wave character?

The end correction for the vibrations of air column in a tube of circular cross-section will be more if the tube is,

The length of a sonometer wire $AB$ is 110 cm. Where should the two bridges be placed from A to divide the wire in three segments whose fundamental frequencies are in the ratio of 1:2:3

Sound waves do not show the phenomenon of

What is the relation between particle velocity (v), the wave velocity (c) and the slope (s) of the wave?

In sine wave, minimum distance between $ 2 $ particles always having same speed is

The maximum particle velocity in a wavemotion is half the wave velocity. Then the amplitude of the wave is equal to

The equation of progressive wave is $y=0.2 \sin 2 \pi\left[\frac{t}{0.01}-\frac{x}{0.3}\right]$, where $x$ and $y$ are in metre and t is second. The velocity of propagation of the wave is

Which of the following expressions is that of a harmonic progressive wave?

A streched string vibrates with a fundamental frequency of $200$ Hz. If its mass per unit length were to be doubled. What would be the frequency of the first harmonic ?

According to Heisenberg's uncertainty principle, the product of uncertainties in position and velocities for an electron of mass $ 9.1\times {{10}^{-31}}\,kg $ is:

When the displacement is half the amplitude the ratio of potential energy to the total energy is:

The phase velocity of a wave described by the equation $\Psi = \Psi_0 \, \sin (kx + \omega t + \pi / 2)$ is