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Statement-1 : Ultrasonics is the acousti...

Statement-1 : Ultrasonics is the acoustic analogue of ultraviolet radiation
Statement-2 : Ultraviolet rays do not produce visual sensations while ultrasonic waves are not heards by the human ear.

A

Statement-1 is true, Statement-2 is true , Statement-2 is correct explanation for Statement-4

B

Statement-1 is true,Statement-2 is true , Statement-2 is NOT a correct explanation for Statement-4

C

Statement-1 is true, Statement-2 is false

D

Statement-1 is false, Statement-2 is true

Text Solution

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The correct Answer is:
A
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Thin films, including soap bubbles and oil slicks, show patterns of alternating dark and bright regions resulting from interference among the reflected light waves. If two waves are in phase their crest and troughs will coincide. The interference will be constructive and the aplitude of the resultant wave will be greater than the amplitude of either constituent wave. if the two waves are out of phase, the crests of one wave will coincide with the troughs of the other wave. The interference will be destructive and the amplitude of the resultant wave will be less than that of either constituent wave. at the interface between two transparent media some light is reflected and some light is refracted. * When incident light, reaches the surface at point a, some of the light is reflected as ray R_(a) and and some is refracted following the path ab to the back of the film. *At point b some of the light is refracted out of the film and part is reflected back refracted out of the fiml as ray R_(c) . R_(a) and R_(c) are parallel. However, R_(c) has travelled the extra distance within the film of abc. if the angle of incidence is small then abc is approximately twice the film's thickness. if R_(a) and R_(c) are in phase they will undergo constructive interference and the region ac will be bright if R_(a) and R_(c) are out of phase, they will undergo destructive interference. * Refraction at an interface never changes the phase of the wave. * For reflection at the interface between two media 1 and 2, if n_(1)ltn_(2) the reflected wave will change phase by pi . if n_(1)gtn_(2) the reflected wave will not undergo a phase change. for reference n_(air)=1.00 * if the waves are in phase after refection at all interfaces, then the effects of path length in the film are Constructive interference occur when (n= refractive index) 2t=mlamda//n" "m=0,1,2,3... .. Destructive interference occurs when 2t=(m+1//2)lamda//n" "m=0,1,2,3... Q. The average human eye sees colors with wavelengths between 430 nm to 680 nm. For what visible wavelength will a 350 nm thick n=1.35 soap film produce maximum destructive interference?

Thin films, including soap bubbles and oil slicks, show patterns of alternating dark and bright regions resulting from interference among the reflected light waves. If two waves are in phase their crest and troughs will coincide. The interference will be constructive and the aplitude of the resultant wave will be greater than the amplitude of either constituent wave. if the two waves are out of phase, the crests of one wave will coincide with the troughs of the other wave. The interference will be destructive and the amplitude of the resultant wave will be less than that of either constituent wave. at the interface between two transparent media some light is reflected and some light is refracted. * When incident light, reaches the surface at point a, some of the light is reflected as ray R_(a) and and some is refracted following the path ab to the back of the film. *At point b some of the light is refracted out of the film and part is reflected back refracted out of the fiml as ray R_(c) . R_(a) and R_(c) are parallel. However, R_(c) has travelled the extra distance within the film of abc. if the angle of incidence is small then abc is approximately twice the film's thickness. if R_(a) and R_(c) are in phase they will undergo constructive interference and the region ac will be bright if R_(a) and R_(c) are out of phase, they will undergo destructive interference. * Refraction at an interface never changes the phase of the wave. * For reflection at the interface between two media 1 and 2, if n_(1)ltn_(2) the reflected wave will change phase by pi . if n_(1)gtn_(2) the reflected wave will not undergo a phase change. for reference n_(air)=1.00 * if the waves are in phase after refection at all interfaces, then the effects of path length in the film are Constructive interference occur when (n= refractive index) 2t=mlamda//n" "m=0,1,2,3... .. Destructive interference occurs when 2t=(m+1//2)lamda//n" "m=0,1,2,3... Q. A 600 nm light is perpendicularly incident on a soap film suspended in air. The film is 1.00 mum thick with n=1.35. Which statement most accurately describes the interference of the light reflected by the two surfaces of the film?

ALLEN -WAVES AND OSCILLATIONS-Part-1(Exercise-03)
  1. Statement-1 : Explosions on other planets are not heard on earth Sta...

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  2. Statement-1 : Vacuum is densest for sound and rarest for light State...

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  3. Statement-1 : Ultrasonics is the acoustic analogue of ultraviolet radi...

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  4. Statement-1 : Infrasonic waves are generally produced by large vibrati...

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  5. Statement-1 : Partially transwave waves are possible on a liquid surfa...

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  6. Statement-1 : The superposition of the waves y(1) = A sin(kx - omega t...

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  7. Statement-1 : Mechanical transverse waves cannot be generated in gaseo...

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  8. Statement-1 : Description of sound as pressure wave is preferred over ...

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  9. Statement-1 : During thunderstrom, light is seen much earlier than the...

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  10. Statement-1 : The flash of lightening is seen before the sound of thun...

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  11. Statement-1 : Earthquakes cause vast devastation. Sometimes short and ...

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  12. Statement-1 : Shock waves produced by supersonic aircraft may be visib...

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  13. Statement-1 : In the case of a stationary wave, a person hear a loud s...

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  14. Statement I: waves genrated in a metal piece can be transverse or long...

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  15. Statement-1 : A balloon filled with CO(2) gas acts as a coverging lens...

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  16. Statement-1 : Node of pressure wave is formed at the open end of an or...

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  17. Assertion:- Transvers waves are produced in a very long string fixed a...

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  18. Statement-1 : When two vibrating tuning forks have f(1) = 300 Hz and f...

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  19. Statement-1 : The fundamental frequency of an organ pipe increases as ...

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  20. The figure represents the instantaneous picture of a transverse wave t...

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