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Homework Statement Monochromatic light, at normal incidence, strikes a thin film in air. If λ denotes the wavelength in the film, what is the thinnest film in which the reflected light will be a maximum? A λ/4 B 3λ/4 C λ D much less than λ E λ/2...

no only number

What is the name of the difference in wavelengths?

Homework Statement Two waves of light in air, of wavelength 550 nm, are initially in phase. They then both travel through a layer of plastic as shown in the figure, with L1 = 4.00 μm, n1 = 1.40, L2 = 3.50 μm , and n2 = 1.60. What is their phase difference after they both have emerged from the...

Homework Statement The longitudinal displacement of a mass element in a medium as a sound wave passes through it is given by s = sm cos (kx – ωt). Consider a sound wave of frequency 330 Hz and wavelength 0.95 m. If sm= 16 µm, what is the displacement of an element of air located at x = 1.1 m...

I didn't get your point. How can I draw diagram for it? Besides why n=3 is not correct? what do they mean by the third such resonance?

Homework Statement A vibrating tuning fork of frequency 512 Hz is held over a water column with one end closed and the other open. As the water level is allowed to fall, a loud sound (resonance) is heard at specific water levels. Assume you start with the tube full of water, and begin steadily...

1) when towards me it is FL1=Fs*v/(v-vs)=880*343/(343-22)=940 Hz when moves away from me FL2=Fs*v/(v+vs)=880*343/(343+22)=827Hz FL2-FL1=827-940=113 Hz Ah okay thanksssss

Suppose we don't have a wall, then how are we supposed to find that frequency received by the person?

Homework Statement : An ambulance has a siren of frequency 880 Hz. You are sitting at a stop light as the ambulance passes you, traveling at a constant 22 m/s. If the speed of sound is 343 m/s, what is the change in the frequency that you hear as the ambulance passes you? A -53 Hz B...

Ah then vs=vL since both are coming toward each other. then fL=976 Hz which is correct :) thanks

Homework Statement A source emits sound with a frequency of 860 Hz. It is moving at 20.0 m/s toward a stationary reflecting wall. If the speed of sound is 343 m/s, what frequency does an observer riding with the source hear? A 860 Hz B 913 Hz C 910 Hz D 765 Hz...

Ah okay. Thanks very much. I used the diameter as a radius wrongly. :) Now it will be 877Hz which is the correct answer

T=tension=160N μ=linear mass=0.35kg/m f is the frequence

Homework Statement The spoke of a wire wheel is 9.5 cm long, 3.5 mm in diameter, and under tension of 2100 N. The wire is made of steel of density 7860 kg/m3. When struck with a metal tool at its center, the spoke rings at its fundamental frequency. What is that frequency? Homework Equations...