5 - Standing waves Questions Answers
how can we calculate ratio of intensities of two sound waves having unequal amplitudes (one having double the amplitude of the other - both are sinusodial waves) and the graph is displacement vs time .
Intensity of a wave depends on two power of amplitude and two power of frequency. Check the graph carefully for getting idea about frequency and details of amplitude are given in the question.
in a stationery wave, there is no energy current, but there is energy density. (TRUE/FALSE)
TRUE
at STP, the speed of sound in hydrogen is 1324ms‾¹ then the spped of sound in air (at STP) is
formula for speed of sound is v = √(γRT/M)
you have to form two equations for the two mediums, for both the mediums γ will be same because Hydrogen and Air both are diatomic gases, T will also be same for both the cases are taken in STP, only M will be different
a person is standing between two vertical walls. he heard the echo of his sound after t = 1s and t = 1.5s. distance between walls is (speed of sound in air = 340ms‾¹
time taken by the sound to reach upto the first wall = 0.5 sec
similarly time taken by the sound to reach upto the second wall = 0.75
so total time = 1.25 sec. so distance between the walls = 340 * 1.25 = 425
which of the following is minimum audible wavelength at room temperature?
(1) 20mm
(2) 20cm
(3)20m
(4) 20km
maximum audible frequency = 20000 Hz
Velocity of sound = 340 m/s
so minimum audible wavelength = 340/20000 m = 34000/20000 cm = 340/20 mm = 17 mm approx 20 mm