1
MHT CET 2023 10th May Morning Shift
+1
-0

If the length of stretched string is reduced by $$40 \%$$ and tension is increased by $$44 \%$$ then the ratio of final to initial frequencies of stretched string is

A
$$2: 1$$
B
$$3: 2$$
C
$$3: 4$$
D
$$1: 3$$
2
MHT CET 2023 10th May Morning Shift
+1
-0

Consider the Doppler effect in two cases. In the first case, an observer moves towards a stationary source of sound with a speed of $$50 \mathrm{~m} / \mathrm{s}$$. In the second case, the observer is at rest and the source moves towards the observer with the same speed of $$50 \mathrm{~m} / \mathrm{s}$$. Then the frequency heard by the observer will be

[velocity of sound in air $$=330 \mathrm{~m} / \mathrm{s}$$.]

A
same in both the cases.
B
more in the second case than in the first case.
C
less in the second case than in the first case.
D
less than the actual frequency in both the cases.
3
MHT CET 2023 9th May Evening Shift
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The equation of simple harmonic progressive wave is given by $$y=a \sin 2 \pi(b t-c x)$$. The maximum particle velocity will be half the wave velocity, if $$\mathrm{c}=$$

A
$$2 \pi \mathrm{a}$$
B
$$\frac{1}{4 \pi \mathrm{a}}$$
C
$$\frac{1}{2 \pi \mathrm{a}}$$
D
$$4 \pi \mathrm{a}$$
4
MHT CET 2023 9th May Evening Shift
+1
-0

Stationary waves can be produced in

A
only solid and gaseous media
B
only liquid and gaseous media
C
only solid and liquid media
D
solid, liquid and gaseous media
EXAM MAP
Medical
NEET