physics mcq help needed! urgent!

[highly_ambitious]

I'm not too good with waves but...

there's a formula for such type of question



for destructive interference the phase difference should be

so if you rearrange the eqn (i substituted phase difference as

=

path difference= S2X-S1X
so you get

=

thank you so much!...it was v.very helpful!

[highly_ambitious]

thank you so much!...it was v.very helpful!

can u explain me the formula I= ka²...? what does k mean here? n in which situation do we apply this formula?

[nid404]

can u explain me the formula I= ka²...? what does k mean here? n in which situation do we apply this formula?

k is a constant.

When they ask you to find intensity or amplitude of a wave and give one of the values

[highly_ambitious]

k is a constant.

When they ask you to find intensity or amplitude of a wave and give one of the values

Thanks!

[nid404]

Thanks!

not a problem 

[zxcvbnm]

can someone please post the wavelengths of the electromagnetic waves? please i need this quickly!

[highly_ambitious]

look in page number 251. International A/AS level Physics by chris mee , mike crundell, brian arnold and wendy brown. This the only book endorsed by cie for physics paper.

[zxcvbnm]

i dont have that book!!! can you pleaseeee post the orders of the wavelengths here???

[highly_ambitious]

Radio waves 10^4 to 10^-1

Microwaves 10^-1 to 10^-4

Infra-red    10^-4 to 10^-6

Visible wave 10^-6 to 10^-7

UV waves 10^-7 to 10^-9

X-ray wave 10^-9 to 10^-12

Gamma ray 10^-12 to 10^-16

[highly_ambitious]

Radio waves 10^4 to 10^-1

Microwaves 10^-1 to 10^-4

Infra-red    10^-4 to 10^-6

Visible wave 10^-6 to 10^-7

UV waves 10^-7 to 10^-9

X-ray wave 10^-9 to 10^-12

Gamma ray 10^-12 to 10^-16

the unit of the wave length is in metres (m).

[zxcvbnm]

Radio waves 10^4 to 10^-1

Microwaves 10^-1 to 10^-4

Infra-red    10^-4 to 10^-6

Visible wave 10^-6 to 10^-7

UV waves 10^-7 to 10^-9

X-ray wave 10^-9 to 10^-12

Gamma ray 10^-12 to 10^-16

thankyou loads!!!!!

[hesho21]

which question?

Hey I meant number 13 in the november 09 paper 11 Thanks in advance

[zxcvbnm]

june 02/question 18....if anybody has any general formula for energy conversion, please help

[astarmathsandphysics]

GPE(initailly)+KE(initail)=GPE(finallt)+work done afgainst friction+KE(final)
50+5=0+10+KE(final)
KE(final)=45

[superduper2009]

Can anyone solve and explain the following questions to me please --- (all are in october/november 2008 paper 1 cie physics)
10,11,27,30
Also can someone explain the following formulas --->
i)dsin(theta)=n(lambda)
ii) lambda= ax/D
also what is the forumla of finding work done from a graph of F vs extension, (is it area under graph???)
And what is the unit of Young's modulus....
Also how do we know from a graph whether a material is ductile, plastic elastic etc etc