Speed of light in vacuum is $3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$. Range of wavelength of visible light is $4000 \stackrel{\mathrm{o}}{\mathrm{A}}-7000 \stackrel{\mathrm{o}}{\mathrm{A}}$. Find the range of frequency of visible light.

Figure shows a string of linear mass density $1.0 \mathrm{g} {\mathrm{cm}}^{-1}$ on which a wave pulse is traveling. Find the time taken by the pulse in traveling through a distance of $50 \mathrm{cm}$ on the string. Take $\mathrm{g}=10 \mathrm{m} {\mathrm{s}}^{-2}$.

Two blocks each having a mass of $3.2 \mathrm{kg}$ are connected by a wire $CD$ and the system is suspended from the ceiling by another wire $AB$. The linear mass density of the wire $AB$ is $10 \mathrm{g} {\mathrm{m}}^{-1}$ and that of $CD$ is $8 \mathrm{g} {\mathrm{m}}^{-1}$. Find the speed of a transverse wave pulse produced in $AB$ and in $CD$.

In the arrangement shown in figure, the string has a mass of $4.5 \mathrm{g}$. How much time will it take for a transverse disturbance produced at the floor to reach the pulley? (Take, $g=10 \mathrm{m} {\mathrm{s}}^{-2}$).

One end of a horizontal rope is attached to a prong of an electrically driven tuning fork that vibrates at $120 \mathrm{Hz}$. The other end passes over a pulley and supports a $1.50 \mathrm{kg}$ mass. The linear mass density of the rope is $0.0550 \mathrm{kg} {\mathrm{m}}^{-1}$.

(a) What is the speed of a transverse wave on the rope?
(b) What is the wavelength?
(c) How would your answers to parts (a) and (b) change if the mass were increased to $3.00 \mathrm{kg}$?