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

 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 between observer and walln’ =nxvvvs

−(for direct waves)n’ =s

vvv+x n (for reflected waves)(g) Moving Target:(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: Ther

e 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 211nxcv1

2222

    −=−(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 SubjectsStudy 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.•

RevisionAlways 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,rela

xation and sharpening your mined (by supplying oxygen to it). Aerobic exercises likeskipping, jogging, swimming and

cycling are also very helpful.Activity (249)

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