212131232131

QUEST - Power Coaching for IITJEE 

1, Vigyan Vihar, Near Anand Vihar, Delhi – 92. Ph: 55270275, 55278916E-

16/289, Sector 8, Rohini, Delhi – 85, Ph: 55395439, 30911585 33(b) Source between observer and walln’ =nxvvvs

+(for direct waves)n’ =s

vvv−x n (for reflected waves)(ii) Source moving away from wall(a) Observer

between source and walln’ =nxvvvs

+(for direct waves)n’ =s

vvv+x n (for reflected waves)(b) Source be

tween observer and walln’ =nxvvvs

−(for direct waves)n’ =s

vvv+x n (for reflected waves)(g) Moving T

arget:(i) S and O stationary at the same place and target approaching with speed un’ =nxuvuv    −+or n’ =

nxvu21    +(for u <<v)(ii) S and O stationary at the same place and target receding with speed un’ =

nxuvuv    +−or n’ =nxvu21    −

(for u <<v)(h) SONAR: n’ =nxvv2 1nxvvvvsubsubsub

    ±≅±± (upper sign for approaching submarine while

lower sign for receding submarine)(i) Transverse Doppler effect: There is no transverse Doppler effect in sound. For velocitycomponent vs

cosθ

 n’=nxcosvvvs

θ±(– sign for approaching and + sign for receding)24. Doppler Effect for light

(a) Red shift (when light source is moving away):n’ =nxc/v1c/v1+−or λ’ =λ−+xc/v1c/v1 For v << c,

∆n = –nxcv    or ∆λ’ =

    cvxλ (b) Blue shift (when light source is approaching)n’ =nxc/v1c/v1−+

or λ’ =λ+−xc/v1c/v1 For v << c,∆n =n cv

    or ∆λ’ =–    cv

λ

Call 1600-111-533 (toll-free) for info. Formula Booklet – Physics XI 

QUEST - Power Coaching for IITJEE

1, Vigyan Vihar, Near Anand Vihar, Delhi – 92. Ph: 55270275, 55278916E-16/289, Sector 8, Rohini, Delhi – 85, Ph:

55395439, 30911585 34(c) Doppler Broadening = 2∆λ= 2    cv

λ (d) Transverse Doppler effect:For light, n’ =nxcv 211nxcv12222

    −=−

(for v << c)(e) RADAR:∆n

=    cv2n

Call 1600-111-533 (toll-free) for info. Formula Booklet – Physics XI 

QUEST - Power Coaching for IITJEE 

1, Vigyan Vihar, Near Anand Vihar, Delhi – 92. Ph: 55270275, 55278916E-16/289, Sector 8,

Rohini, Delhi – 85, Ph: 55395439, 30911585 35

STUDY TIPS•Combination of Subjects

Study a combination of subjects during a day i. e. after studying 2–3 hrs of mathematicsshift to any theoretical subject for 2 horrs. When we

study a subject like math, aparticular part of the brain is working more than rest of the brain. When we shift to atheoretical subject,

practically the other part of the brain would become active and thepart studying maths will go for rest.•Revision

Always refresh your memory by revising the matter learned. At the end of the day youmust revise whatever you’ve learnt during that day (or revise the

previous days workbefore starting studies the next day). On an average brain is able to retain the newlylearned information 80% only for 12 hours, after that the

forgetting cycle begins. After this revision, now the brain is able to hold the matter for 7 days. So next revision shouldbe after 7 days (sundays could be kept for

just revision). This ways you will get rid of theproblem of forgetting what you study and save a lot of time in restudying that topic.•

Use All Your SensesWhatever you read, try to convert that into picture and visualize it.Our eye memory ismany times

stronger than our ear memory since the nerves connecting brain to eye aremany times stronger than nerves connecting brain to ear. So instead

of trying to mug upby repeating it loudly try to see it while reapeating (loudly or in your mind). This isapplicable in theoritical subjects. Try to use all your

senses while learning a subjectmatter. On an average we remember 25% of what we read, 35% of what we hear, 50%of what we say, 75% of what

we see, 95% of what we read, hear, say and see.•Breathing and RelaxationTake special care of your breathing. Deep

breaths are very important for relaxing your mind and hence in your concentration. Pranayam can do wonders to your concentration,relaxation and

sharpening your mined (by supplying oxygen to it). Aerobic exercises likeskipping, jogging, swimming and cycling are also very helpful.

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