Light waves with two different wavelengths, 632 nm and 474 nm, pass simultaneously through a single slit whose width is 8.32 x 10-5 m and strike a screen 2.00 m from the slit. Two diffraction patterns are formed on the screen. What is the distance (in cm) between the common center of the diffraction patterns and the first occurrence of the spot where a dark fringe from one pattern falls on top of a dark fringe from the other pattern

 

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Light waves with two different wavelengths, 632 nm and 474 nm, pass simultaneously through a single slit whose width is 6.59 10-5 m and strike a screen 1.13 m from the slit. Two diffraction patterns are formed on the screen. What is the distance (in cm) between the common center of the diffraction patterns and the first occurrence of a dark fringe from one pattern falling on top of a dark fringe from the other pattern?

 

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Light passes through a 230 lines/mm grating and is observed on a 1.4-{rm m}-wide screen located 1.4 m behind the grating. Three bright fringes are seen on both sides of the central maximum.Max wavelength and Min wavelength?

 

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Light of wavelength 500 nm illuminates a round 0.50-mm diameter hole. A screen is placed 8.1 m behind the slit. What is the diameter of the central bright area on the screen?

a)350um

b)4900 um

c)9.9 mm

d)20 mm

with full solution

 

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Light from an incandescent bulb lamp is observed through a cloud of cool nitrogen gas. Again two students are having a discussion about the kind of spectra that they would see.

Student 1: We would see absorption line spectra and the missing lines would correspond to the light from the incandescent lamp.

Student 2: I disagree. We would see an emission line spectra corresponding to nitrogen. This would happen because the nitrogen gas would absorb some energy from the incandescent lamp and would reemit this energy which would result in an emission line spectra.

Which student, if any, do you agree with?

 

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