Two microwave signals of nearly equal wavelengths can generate a beat frequency if both are directed onto the same microwave detector. In an experiment, the beat frequency is 110 MHz. One microwave generator is set to emit microwaves with a wavelength of 1.500 cm. If the second generator emits the longer wavelength, what is that wavelength? Express your answer to four significant figures and include the appropriate units.

You and your friend decided to test out the Doppler Effect. Your friend is in their car, driving towards you at 4.2 m/s, playing a 400 Hz test tone. You are moving towards your friend at 0.5 m/s. At what frequency do you hear this test tone? Assume the speed of sound is 340 m/s. (Recall that we set the POSITIVE x-direction as the direction from the observer to the source)

Intensity is a measure of incoming power per unit area. If I is the intensity of the incoming energy within an illuminated region of area, A, then the total received power is given by: P = JA where I depends on the power of the radiating source, how it spreads and how far away it is from the illuminated region. lashlight on a Wall Suppose that a flashlight beam spreads uniformly over a circular region as shown in the figure above. (a) If P bulb is the radiated power, and r is the radius of the circle, which expression gives the intensity, , within the illuminated region? Pbulb P bulb 4πr² (b) Which expression should you use to calculate the total incoming (received) power, Pin, over a square of side length, s, that is completely illuminated by the beam as shown in the above figure? Os²el O² O 4πr²e bulb 2ftr You shine the 13.5-cm radius circular beam of a 70-W flashlight on a square sticky-note with side length 8.1-cm that is tacked to a nearby wall as shown in the figure above. (c)…

An interface is formed between a block of aluminium (with an acoustic impedance of 1.8 x 107 kg m2 s') and a block of copper (with an acoustic impedance of 4.6 x 107 kg m-2 s-1). Longitudinal sound waves travelling through the aluminium are normally incident on the boundary, and are partially reflected. a) What is the ratio of the amplitude of the reflected wave to that of the incident wave? Number b) What is the ratio of the amplitude of the transmitted wave to that of the incident wave? Number c) What percentage of the incident power is transmitted? Number d) What percentage of the incident power is reflected? Number % Ouit P Sove Questi