NEET Physics Electromagnetic Waves MCQs

A monochromatic electromagnetic wave propagates in vacuum. If its electric field amplitude is $E_0$ and magnetic field amplitude is $B_0$, which of the following relations is NOT correct?

A source emits electromagnetic radiation with a peak wavelength of $\lambda_1$ at temperature $T_1$. If the temperature is increased to $T_2 = 4T_1$, what will be the new peak wavelength $\lambda_2$?

An electromagnetic wave has a frequency $f$ and wavelength $\lambda$ in a medium with refractive index $n$. If the same wave enters vacuum, which quantity remains unchanged?

Which of the following electromagnetic radiations has the highest penetrating power?

The Earth's atmosphere is transparent to most of the electromagnetic spectrum EXCEPT for a significant portion of which type of radiation, primarily absorbed by the ozone layer?

A wave propagating along a string is described by $y(x,t) = 0.005\sin(80.0x - 3.0t)$, where $x$ and $y$ are in meters and $t$ is in seconds. If the linear mass density of the string is $0.004\ kg/m$, what is the average power transmitted by the wave?

Two waves on a string are described by $y_1(x,t) = A\cos(kx - \omega t)$ and $y_2(x,t) = A\cos(kx + \omega t + \phi)$. For what value of $\phi$ will the resultant wave have an amplitude of $A$?

A standing wave on a string fixed at both ends is described by $y(x,t) = 0.04\sin(2\pi x)\cos(100\pi t)$ (in SI units). The fundamental frequency of the string is:

A wave pulse traveling along a thick rope reaches a discontinuity where the rope becomes thinner and lighter. Which of the following is NOT true about the transmitted and reflected pulses?

A wave traveling in a medium undergoes a change in its speed. Which of the following quantities associated with the wave necessarily remain constant?