Waves · Physics · AP EAPCET
MCQ (Single Correct Answer)
Two cars are moving towards each other at the speed of $$50 \mathrm{~ms}^{-1}$$. If one of the cars blows a horn at a frequency of 250 Hz , the wave length of the sound perceived by the driver of the other car is
(Speed of sound in air $$=350 \mathrm{~ms}^{-1}$$)
Speed of sound in air near room temperature is approximately
A body is suspended from a string of length 1 m and mass 2 g. The mass of the body to produce a fundamental mode of 100 Hz frequency in the string is (Acceleration due to gravity $$=10 \mathrm{~ms}^{-2}$$)
A string fixed at both ends vibrate in 5 loops as shown in the figure. The total number of nodes and anti-nodes respectively are
Match the following.
| Column I | Column II | ||
|---|---|---|---|
| (A) | Transverse wave through a steel rod | 1. | $$\sqrt{B+\left(\frac{4}{3}\right)\frac{\eta}{\rho}}$$ |
| (B) | Longitudinal waves in Earth's crust | 2. | $$\sqrt{\frac{\eta}{\rho}}$$ |
| (C) | Longitudinal waves through a steel rod | 3. | $$\sqrt{\frac{2\pi T}{\rho \lambda}}$$ |
| (D) | Ripples | 4. | $$\sqrt{\frac{\lambda}{\rho}}$$ |
The sources of sound A and B produce a wave of 350 Hz in same phase. A particle P is vibrating under an influence of these two waves. If the amplitudes at P produced by the two waves is 0.3 mm and 0.4 mm, the resultant amplitude of the point P will be, when AP $$-$$ BP = 25 cm and the velocity of sound is 350 ms$$^{-1}$$