To increase loudness of sound by four times, how much should the amplitude of vibration be changed?

If the sound level in a room is increased from 50 dB to 60 dB, by what factor is the pressure amplitude increased ?

The price of a plant reduced by ₹ 6 per week for 7 weeks. By how much did the price of the plant change over the 7 weeks?

Can we perform Young's double slit experiment with sound waves? To get a reasonable fringe pattern what should be the order of separation between the slits? How can the bright fringes an the dark fringes be detected in this case?

A sound wave of wavelength 40 cm travels in air. If the difference between the maximum and minimum pressures at a given point is 1.0xx10^-3Nm^-2 , find the amplitude of vibration of the particle o the medium. The bulk modulus of air is 1.4xx10^5Nm^-2 .

A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350 ms^-1 (a) By how much is the phase changed at a given point in 2.5 ms ? (b) What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation ?

In Quincke's experiment, the sound intensity has a minimum value I at a particular position. As the sliding tube is pulled out by a distance of 16.5 mm, the intensity increases to a maximum of 9 I. Take the speed of sound in air to be 330 m s^-1. (a) Find the frequency of the sound source. (b) Find the ratio of the amplitudes of the two waves arriving at the detector assuming that it does not change much between the positions of minimum intensity and maximum intensity.

For a reaction : aA rarr bB , the rate of reaction is doubled when the concentration of A is increased by four times. The rate of reaction is equal to

When viewing through a compound microscope, our eyes should be positioned not on the eyepiece, but a short distance away from it for best viewing . why ? How much should be that short distance between the eye and eyepiece?