Q- You have obtained a diffraction pattern on a distant screen from a plane diffraction grating consisting of alternate transparent and opaque lines with widths a and b respectively. How will the pattern be affected if the widths a and b are interchanged? Consider
(a) Change in intensity
(b) Absen…
Q- Two polarizing sheets have their transmission axes crossed so that no light gets through. A third sheet is inserted between the first two such that its transmission axis makes an angle θ with that of the first sheet. Unpolarized light of intensity I0 is incident on the first sheet. Find the inte…
Q- Light of wavelength λ = 450 nm illuminates two slits. Slit A has a larger opening than slit B. The center of slit A is at y = 0, and the center of slit B is at y = d = 0.1 cm. The screen is L = 1 m away from the plane of the slits. When slit A is open and slit B is closed, the light intensity on…
Q- In a location where the speed of sound is 354 m/s, a 2000 Hz sound wave impinges on two slits 30.0 cm apart.
(a) At what angle with the perpendicular bisector of the slits is the first maximum located?
(b) If the sound wave is replaced by a 3.00 cm microwave, what slit separation gives the…
Q- Un-polarized light enters a series of three polarizers. The axis of polarization of second makes an angle of 60 degree with that of first and the angle between the axes of second and third is 45 degree. What percentage of the initial intensity of light is transmitted through the system of polariz…
Q- Lasers can be used to drill or cut material. One such laser generates a series of high-intensity pulses rather than a continuous beam of light. Each pulse contains 420 mJ of energy and lasts 10 ns. The laser fires 10 such pulses per second.
(a) What is the peak power of the laser light? The peak…
Q- A distant galaxy is simultaneously rotating and receding from the earth. As the drawing shows, the galactic center is receding from the earth at a relative speed of uG = 1.8*106 m/s. Relative to the center, the tangential speed is vT = 0.3*106 m/s for locations A and B, which are equidistant from…
Q1- Light from an argon laser strikes a diffraction grating that has 5310 grooves per cm. The center and the first order principal maximum are separated by 0.488 m on a wall 1.72 m from the grating. Determine the wavelength of the laser light.
Q2- A helium-neon laser (λ = 632 nm) is used to calibr…
Q1- A cell phone broadcasts 800 MHz signal. If it is operated from the space between two massive radio-wave absorbing buildings with 15 m space between them, what is the angular width of the electromagnetic wave after it emerges from between the buildings?
Q2- How far behind the pinhole should the …
Q1- Light of wavelength 589 nm from a sodium lamp illuminates two narrow slits. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm. What is the spacing between the two slits?
Q2- A double-slit experiment is performed with light of wavelength 600 nm. The bright interference fringes a…
Q- Two light waves of wavelength 620 nm are initially exactly in phase. The waves pass through to different media of indexes of refraction n1= 1.40 and n2= 1.60. What is the thickness L of each medium that will put the waves out of phase once they pass through the two media? What is the next greater…
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