A point source emits sound equally in all directions in a non-absorbing medium. Two points, P and Q, are at distances of $$2$$ m and $$3$$ m, respectively, from the source. The ratio of the intensities of the waves at P and Q is:
1. $$3:2$$
2. $$2:3$$
3. $$9:4$$
4. $$4:9$$

Subtopic: Â Energy of Waves |
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AIPMT - 2005
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The rate of energy transfer in a wave depends:

 1 directly on the square of the wave amplitude and square of the wave frequency 2 directly on the square of the wave amplitude and square root of the wave frequency 3 directly on the wave frequency and square of the wave amplitude 4 directly on the wave amplitude and square of the wave frequency
Subtopic: Â Energy of Waves |
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Two waves represented by the following equations are travelling in the same medium $$y_1 = 5 sin2\pi (75t-0.25x)$$$$y_2 = 10 sin2\pi (150t-0.50x)$$${}_{}$
The intensity ratio $$\frac{I_1}{I_2}$$ of the two waves will be:
1. $$1:2$$
2. $$1:4$$
3. $$1:8$$
4. $$1:16$$

Subtopic: Â Energy of Waves |
From NCERT
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