Assertion :A person is standing near railway track. A train is moving on the track. As the train is approaching the person, apparent frequency keeps on increasing and when the train has passed the person, then apparent frequency keeps on decreasing. Reason: When train is approaching the person then,
$f = f_{o} [\frac{c}{c - u}]$
and then train is moving away from person
$f = f_{o} [\frac{c}{c + u}]$
Here, $c$ is velocity of sound, $u$ is velocity of train and $f_{o}$ is original frequency of whistle.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is correct but Reason is incorrect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is incorrect but Reason are correct

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D Assertion is incorrect but Reason are correct
The words " frequency keeps on increasing or decreasing" are wrong, as it will be a fixed frequency either approaching(larger than original) or departing(smaller than original), but intensity changes. And it changes according to the reason. Option "D" is correct.

Suggest Corrections

Similar questions

Assertion: The sides of a triangle are 3cm, 4cm and 5cm. Its area is $6 c m^{2}$

Reason: If 2s = (a + b + c), where a, b, c are the sides of a triangle, then area

$= \sqrt{(s - a) (s - b) (s - c)}$

Which of the following is correct?

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

Statement-1 : In (cyclobutadiene) all C-C bond lengths are equal.

Statement-2 : Cyclobutadiene is aromatic and the

Π

orbitals are orthogonal to each other.

The Assertion and Reason are given, you are required to choose any one of the following four responses.

A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C) The Assertion is correct but Reason is incorrect

D) Both Assertion and Reason are incorrect

Join BYJU'S Learning Program