Two identical wires of length 1.4 m and mass 30 g are each fixed at both ends. W

Question

Two identical wires of length 1.4 m and mass 30 g are each fixed at both ends. When the wires are plucked, they both vibrate at the fundamental frequency of 100 Hz. Which of the following increases in the tension of one of the wires, in N, would lead to a beat frequency of 2 Hz between the two wires? 40 68 80 24 12 On a day when there is no wind, you are at rest and a source of sound waves is moving toward you. Compared to what you would hear if the source were not moving, the sound that you hear has a higher frequency and a shorter wavelength the same frequency and a shorter wavelength a higher frequency and the same wavelength the same frequency and the same wavelength a lower frequency and a longer wavelength A solid object has a hole in it. Which of the illustrations more correctly shows how the size of the object and the hole change as the temperature increases? Illustration #1 Illustration #2 The answer depends on the material of which the material is made The answer depends on how much the temperature increases ??th C and D are correct

Explanation / Answer

(70) The frecuencie perceived is higher and the wavelenght is shorter

(71) the answer is E, the answer depends on much temperature increase and also of the material it is made of, because the equation of dilataion includes the linear expansion coefficient of the material and delta temperature .

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