Determine the wavelength and amplitude of each of the two waves in figure.

Two waves.

A microphone detects sound waves. The microphone is connected to a $\mathrm{CRO}$. On the $\mathrm{CRO}$ screen, two complete cycles occupy five scale divisions along the $x$-axis. The calibrated time-base is set on $0.005{\mathrm{sdiv}}^{-1}$.

Determine the frequency of the sound waves.

A $100 \mathrm{W}$ Lamp emits electromagnetic radiation in all directions. Assuming the lamp to be a point source,  Calculate the intensity of the radiation:

(a) At a distance of $1.0 \mathrm{m}$ from the lamp

A $100 \mathrm{W}$ Lamp emits electromagnetic radiation in all directions. Assuming the lamp to be a point source Calculate the intensity of the radiation:

(b) At a distance of $2.0 \mathrm{m}$ From the lamp.

A wave from a source has an amplitude of $5.0 \mathrm{cm}$ and an intensity of $400{\mathrm{Wm}}^{-2}$.

(a) The amplitude of the wave is increased to $10.0 \mathrm{cm}$. Calculate the intensity now.

A wave from a source has an amplitude of $5.0 \mathrm{cm}$ And an intensity of $400{\mathrm{Wm}}^{-2}$.

(b) The intensity of the wave is decreased to $100 \mathrm{W}{\mathrm{m}}^{-2}$ Calculate the amplitude now.

An oscillator is used to send a transverse wave along a stretched string. The wavelength of the wave is $5.0 \mathrm{cm}$ when the frequency of the oscillator is $30 \mathrm{Hz}$. For this wave, calculate:

(a) Its frequency