A thin film of glass ( $n=1.50$ ) floats on a liquid of $n=1.35$ and is illuminated by light of $\lambda=580 \mathrm{~nm}$ incident from air above it. Find the minimum thickness of the glass, other than zero, that will produce destructive interference in the reflected light.

In a location where the speed of sound is 354 m/s, a 2 000-Hz sound wave impinges on two slits 30.0 cm apart. At what angle is the first maximum located?

White light spans the wavelength range between about $400 \mathrm{~nm}$ and $700 \mathrm{~nm}$. If whith light passes through two slits $0.30 \mathrm{~mm}$ apart and falls on a screen $1.5 \mathrm{~m}$ from the slits, find the distance between the first-order violet and the first-order red fringes.

A thin film, with a thickness of 272.7 nm and with air on both sides, is illuminated with a beam of white light. The beam is perpendicular to the film and consists of the full range of wavelengths for the visible spectrum. In the light reflected by the film, light with a wavelength of 600.0 nm undergoes fully constructive interference. At what wavelength does the reflected light undergo fully destructive interference? (Hint: You must make a reasonable assumption about the index of refraction.)

A flat coil enclosing an area of 0.10 m$^2$ is rotating at 60 rev/s, with its axis of rotation perpendicular to a 0.20-T magnetic field. When the maximum induced voltage occurs, what is the orientation of the coil with respect to the magnetic field?

The wavelength range for visible light is $400 \mathrm{~nm}$ to $700 \mathrm{~nm}$ in air. What is the frequency range of visible light?

Do the situations in Figure mentioned represent possible electromagnetic waves? If not, why not?

Light of wavelength $460 \mathrm{~nm}$ falls on two slits spaced $0.300 \mathrm{~mm}$ apart. What is the required distance from the slit to a screen if the spacing between the first and second dark fringes is to be $4.00 \mathrm{~mm}$ ?

A laser beam is incident on two slits with a separation of 0.200 mm, and a screen is placed 5.00 m from the slits. If the bright interference fringes on the screen are separated by 1.58 cm, what is the wavelength of the laser light?

A laser beam $(\lambda=632.8 \mathrm{~nm})$ is incident on two slits $0.200 \mathrm{~mm}$ apart. How far apart are the bright interference fringes on a screen $5.00 \mathrm{~m}$ away from the double slits?

Why is it so much easier to perform interference experiments with a laser than with an ordinary light source?

A sheet of glass is coated with a 500-nm-thick layer of oil (n = 1.42). a. For what visible wavelengths of light do the reflected waves interfere constructively? b. For what visible wavelengths of light do the reflected waves interfere destructively? c. What is the color of reflected light? What is the color of transmitted light?

Suppose the film has an index of refraction of $1.36$ and is surrounded by air on both sides. Find the minimum thikkness that will produce constructive interference in the reflected light when the film is illuminated by light of wavelength $500 \mathrm{~nm}$.

Would it be possible to place a nonreflective coating on an airplane to cancel radar waves of wavelength 3 cm?