SOS for Physics P1

[nannes]

Q 23 and 25 O/N 07 P1

 

[princesszahra]

q23
one wave completes at 50 m
and speed is 8
so u get time
using speed = distance/time
time is 6.25s
u get frequency
ie 1/time
so u get 0.16
now put in the eqaution
lemme know
i am waiting for ur response

 

[princesszahra]

q25
use d sin angle = n lambda
put angle ( tetha ) as 45 and n as 3 and u get an equation making d the subject
now for highest order
angle should be 90 degrees
u need to remember this
put angle as 90 and make d the subject again
now u get two euqions
slove em
solve it by the method that they both r equal

 

[nannes]

da answer which i m not gettin

 

[nannes]

what do i use for lambda

 

[princesszahra]

which one???????????

 

[nannes]

i am gettin a weird answer for 23...not one of the options and for 25 what shud i use for lambda

 

[princesszahra]

in 25 lambda is constant
will get cancelled out

 

[princesszahra]

ok for q23
after the steps i wrote
u do it this way
u get freuency as 0.16
now find v max
ie 2 x pi x amplitude( which is 2 from graph) x freq
ke max is
half x m x v^2
ull get 4mJ

 

[nannes]

ahan and for 23...

 

[nannes]

Thanks a million mate

 

[princesszahra]

u r welcome!!!!!!!!!!!!!!!!