Waves and Optics
JUPEB Physics

Find the period of a wave whose frequency is $250$ Hz.

The colour of visible light is determined by its

A sound wave of frequency $170$ Hz travels in air at $340$ m s$^{-1}$. Find its wavelength.

Which of the following is a longitudinal wave?

A ray of light passes from air into glass with an angle of incidence of $60^\circ$ and an angle of refraction of $30^\circ$. Find the refractive index of the glass.

Find the critical angle for glass of refractive index $1.5$.

An object is placed $15$ cm in front of a concave mirror of focal length $10$ cm. Find the position and nature of the image.

An object is placed $30$ cm from a converging lens of focal length $20$ cm. Find the magnification of the image.

The speed of light in a vacuum is $3 \times 10^8$ m s$^{-1}$. Find its speed in glass of refractive index $1.5$.

A boy standing some distance from a cliff claps his hands and hears the echo $2$ s later. If the speed of sound in air is $340$ m s$^{-1}$, how far is he from the cliff?

A string of length $0.5$ m is fixed at both ends. If the speed of transverse waves on the string is $200$ m s$^{-1}$, find the fundamental frequency.

In Young's double-slit experiment, light of wavelength $600$ nm falls on two slits $0.5$ mm apart and the fringes are viewed on a screen $2$ m away. Find the fringe separation.