Physics Question! [True or False]?

Question

3 True and False Questions.

Please explain! Thank You!

[1] Both transverse and longitudinal waves can exhibit diffraction phenomena.

[2] LASER beam travels through a vaccum space faster than microwaves.

[3] Two beams of light, one is yellow and the other blue, go through a glass block. If the refractive index of glass for the yellow light is smaller than that for the blue light, the yellow light should travel faster (than the blue light) through the glass.

Answer 1

1. True. As long as the polarization planes of the two waves are oriented the same way, they can interfere.

2. False. They are both electromagnetic waves and, as such, they travel at about 3x10^8 m/s

3. True. The 'refractive index' is a measure of how fast waves travel in the medium. It is calculated as
Ir = c/Vm where c is 3x10^8 m/s and Vm is the propagation velocity in the medium. The larger the refractive indes, the slower the propagation velocity in the medium.

As an aside, the variation in propagation velocity with wavelength is an optical characteristic called 'dispersion'.

HTH

Doug

Answer 2

1) true. all forms of transverse and longitudinal waves can be diffracted 2) false. all forms of electromagnetic radiation, either laser light or microwaves travel at the same speed , 300000000 metres per second . 3)true.yellow light has a larger wavelenght than blue light so the velocity (or speed)of the yellow light is higher

Answer 3

[1] True, sound (longitudinal wave) and light (transverse wave) both show diffraction.
[2] false, all electromagnetic waves travel with same speed (c=3*10^8 m/s) in vacuum
[3] True Refractive index (R I) of a medium =[c / v ]
where c is velocity of light in vacuum and v is velocity of light in given medium
velocity of yellow is more than velocity of blue that is why R I of yellow is smaller than R I of blue

Answer 4

both of them show diffraction,but it is considerably noticable only for transverse waves ,as their wavelengths are much larger ,even a large obstacle can cause diffraction, but only small slits of the order of nanometres can cause diffraction in the case of long waves like light waves, which have smaller wavelengths.
laser beams travel coherently, that is their beams have higher energy as they cant be scattered ,they travel as a single beam and their monodirectional behaviour can take them to long distances, but they wont have velocity greate than microwaves,eventhough they can travel larger distance.
microwaves have lower energies ,hence they die out after travelling for a small distance.but they have higher velocity
3]
n is smaller for yellow, it wont travel faster.if n is greater the wave will be refracted through larger angles, hence travel longer distance,so they need to have larger velocities to keep up with other wavelengths which travel shorter distance.

Answer 5

Is this like the John Boy and Billy Stuipi Quiz, the answer is always C. Ok, I pick C.

Answer 6

!. False
2. False
3. True

Answer 7

T, F, F