AIPMT 2015 | Waves Question 19 | Physics

AIPMT 2015

MCQ (Single Correct Answer)

-1

A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is

10.5 Hz

105 Hz

155 Hz

205 Hz

AIPMT 2014

MCQ (Single Correct Answer)

-1

The number of possible natural oscillations of air column in a pipe closed at one end length 85 cm whose frequencies lie below 1250 Hz are (Velocity of sound = 340 m s^$$-$$1)

AIPMT 2014

MCQ (Single Correct Answer)

-1

Out of Syllabus

A speeding motorcyclist sees traffic jam ahead him. He slows down to 36 km hour^$$-$$1. He finds that traffic has eased and a car moving ahead of him at 18 km hour^$$-$$1 is honking at a frequency of 1392 Hz. If the speed of sound is 343 m s^$$-$$1, the frequency of the honk as heard by him will be

1332 Hz

1372 Hz

1412 Hz

1454 Hz

AIPMT 2014

MCQ (Single Correct Answer)

-1

If n₁, n₂ and n₃ are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by

$${1 \over n} = {1 \over {{n_1}}} + {1 \over {{n_2}}} + {1 \over {{n_3}}}$$

$${1 \over {\sqrt n }} = {1 \over {\sqrt {{n_1}} }} + {1 \over {\sqrt {{n_2}} }} + {1 \over {\sqrt {{n_3}} }}$$

$$\sqrt n = \sqrt {{n_1}} + \sqrt {{n_2}} + \sqrt {{n_3}} $$

n $$=$$ n₁ + n₂ + n₃

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