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Which of the following is incorrect?...

Which of the following is incorrect?

A

it the wave is longitudinal then it must be a mechanical wave

B

if the wave is mechanical then it may or not be transverse wave

C

Mechanical waves cannot propagate in vacuum

D

Diffractor helps us to distinguish between sound wave and light wave

Text Solution

Verified by Experts

The correct Answer is:
D
Polarisation help us to distinguish between sound wave and light wave
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DC PANDEY-WAVE OPTICS-Check point
  1. A light wave is incident normally over a slit of width 24xx10^-5cm. Th...

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  2. The first diffraction minima due to a single slit diffraction is at th...

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  3. Light of wavelength 6328 Å is incident normally on a slit of width 0.2...

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  4. Write two points of difference between interference and diffraction pa...

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  5. The X-ray cannot be diffracted by means of an ordinary grating due to

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  6. A polariser in used to

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  7. Which of the following cannot be polarised?

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  8. Light waves can be polarised as they are

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  9. The transverse nature of light is shown by

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  10. Through which character we can distinguish the light waves from sound ...

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  11. Which of the following is incorrect?

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  12. An optically active compound

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  13. A polaroid is placed at 45^(@) to an incoming light of intensity l(0) ...

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  14. When the angle of incidence on a material is 60^(@), the reflected lig...

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  15. The angle of polarisation for any medium is 60^(@) , what will be crit...

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  16. The angle of incidence at which reflected light is totally polarized f...

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  17. A light has amplitude A and angle between analyser and polariser is 60...

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  18. Light is incident on a glass surface at polarising angle of 57.5^(@) T...

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  19. When unpolarised light beam is incident from air onto glass (n=1.5) at...

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  20. The Brewster angle for the glass air interface is 54.74^(@) if a ray o...

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