WB JEE 2008 | Waves Question 3 | Physics

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

Two stretched strings have lengths l and 2l while tensions are T and 4T respectively. If they are made of same material the ratio of their frequency is

2 : 1

1 : 2

1 : 1

1 : 4

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

When sound is produced in an aeroplane with a velocity of 200 m/s horizontally its echo is heard after $$10\sqrt 5 $$ seconds. If velocity of sound in air is 300 ms^$$-$$1 the elevation of aircraft is

250 m

$$250\sqrt 5 $$ m

1250 m

2500 m

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

Two turning forks of frequencies n₁ and n₂ produces n beats per second. If n₂ and n are known, n₁ may be given by

$${{{n_2}} \over n} + {n_2}$$

$${n_2}n$$

$${n_2}\, \pm \,n$$

$${{{n_2}} \over n} - {n_2}$$

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

A car moving with a velocity of 36 km/hr crosses a siren of frequency 500 Hz. The apparent frequency of siren after passing it will be

520 Hz

485 Hz

540 Hz

460 Hz

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