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## Aadarsh 3 years ago An attachment of Questions.

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1. Aadarsh

Solve and explain all the questions given in the attachemnt file.

2. apoorvk

length of night increases, and change to night from day and vice-versa would occur quite suddenly as there will be no atmosphere to cause diffraction as well scattering light rays.

3. Aadarsh

Okay. The other questions please......................

4. apoorvk

A prism has two inclined surfaces, so even if you the light is incident perpendicular to the first surface, it will bend while emerging from the second. (mudna toh hai hi)

5. Aadarsh

But is there any difference between the refraction of monochromatic and polychromatic light?

6. Ishaan94

But why would night's period increase?

7. apoorvk

|dw:1334821169427:dw| ab ek aur image hoga shaayad, main soch nahi paa raha abhi, bata hoon ek minute ruko. The difference between refraction for monochromatic and polychromatic light is only this that polychromatic light is made up of more than one wavelengths of light. Now, for different wavelengths, relative refractive index is different, toh bending kisi mein kam kisi mein zyada hogi.(jaise color spectrum mein hota hai) @Ishaan94 explanation for why days would get shorter is that, when the earth then while rotating, when a certain longitude of it is just about to lose direct reception of sun rays, would suddenly get dark. BUT, in the present case, due to atmosphere (OOPS i forgot to mention the most important phenomena here - REFRACTION), light rays bend, and reach that portion of the earth for just a few more minutes than they would have. This elongates the daylight period.

8. apoorvk

|dw:1334821864367:dw|

9. Aadarsh

Good figure by the way @apoorvk bhai..............)

10. apoorvk

|dw:1334822038038:dw| Now in this question, there is no net force on the block due to the movement of the elevator, since it is moving with a constant velocity. But the lift moves up by 2m in that once second, and the block also moves by 2metres (since there is no net motion on the incline)

11. Aadarsh

@neha2050 didi, please try. @adityanaik28 bhai, please try.

12. Taufique

hey @ Aadarsh bhai kahan ho..

13. Aadarsh

@Taufique bhai, kahiye ji.

14. Taufique

av time nahi hai bhai rat tak in sab ka solution vej dunga bhai..Explanation k sath...

15. Aadarsh

Ji haan. Thanks a lot bhai.

16. Taufique

wo wala sin^-1x wala graph dekhkr samaj aya tha na bhai,or apparent depth wala physics ka question...

17. Aadarsh

Ji haan. Samajh mein to aaya hia.

18. Taufique

ok bhai thik hai iska v vejdunga bhai...

19. Aadarsh

Ji haan. Sure............)

20. Taufique

wo ruchi ko ap samjayega thora hehe

21. Aadarsh

ji haan. will try.

22. Taufique

chromatic light means jante ho ap kuch..

23. Aadarsh

Ji nahin. Itna kuch nahin. Abhi to apoorv bhai ne samjhaya tha aur mein thoda bahut samajh gaya.

24. Taufique

kiya samje...

25. Aadarsh

Jo bhaiya ne definition diya hai, regarding polychromatic light is made of more than one wavelength of light..............

26. Taufique

thik hai bhai.. sahi kha usne Aadarsh...

27. Aadarsh

Yeah. aap raat tak sab kuch post kar dijiye.

28. Taufique

thik hai beye bhai kar dunga..

29. apoorvk

Hmm, @Aadarsh continuing with the lift-question. So, the block moves up by 2m. And the force of friction is acting at an angle of 45 degrees with the displacement. Its magnitude is (mu *mg * cos45) = mg*sin45 (since the FBD shows that the gravitational force along the incline is being balanced by the frictinal force, causing the block to remain at rest w.r.t. the incline) So work done by friction = = W = F.s.cos(x) ...here F = frictional force's magnitude, s=displacement, x= angle between the direction of the force that is acting and the displacement = 45 degrees S0, W = mgsin45 * s * cos 45 = 10/sqrt2 * 2 * 1/sqrt2 = 10 J.

30. sanjeeth

i wanted to post but i needed to shut the computer

31. Taufique

32. Taufique

|dw:1334963628922:dw|

33. Taufique

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