The work function of a surface is given by 3.3X10-19 J. Find the threshold frequency of the surface. 7.5X1014 Hz 5.5X1012 Hz 5X1014 Hz O 2.5X1014 Hz
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- An open air column of length 1.60 m is in air at 23.8 °C. What is the frequency of the fourth harmonic?A 0.20 kg mass on a horizontal spring is pulled back a certain distance and released. The maximum speed of the mass is measured to be 0.28 m/s. If, instead, a 0.40 kg mass were used in this same experiment, the maximum speed would beA. 0.14 m/s B. 0.20 m/s C. 0.28 m/s D. 0.40 m/s E. 0.56 m/sYou place your ear onto a steel railroad track and hear the sound of a distant train through the rails Δt = 2.7 seconds before you do through the air. The speed of sound in steel is vs = 6100 m/s, and and the air temperature is 36° C. Find the distance, D, to the train in meters.
- Light is an electromagnetic wave and travels at a speed of 3.00 x 10° m/s. The human eye is most sensitive to yellow-green light, which has a wavelength of 5.68 × 107 m. What is the frequency of this light?There is a tube of length 1.0 m with one end closed. You clapped your hand at the mouth of the tube once. The echo of the clap came back after 6.0 milliseconds. What is the velocity of sound in the tube ? 330 m/s O 320 m/s 290 m/s O 170 m/sHooke's law describes a certain light spring of unstretched length 33.0 cm. When one end is attached to the top of a door frame and a 5.00-kg object is hung from the other end, the length of the spring is 48.5 cm. Answer parts a-b.
- A jogger hears a car alarm and decides to investigate. While running toward the car, she hears an alarm frequency of 872.10 Hz. After passing the car, she hears the alarm at a frequency of 850.10 Hz. If the speed of sound is 343 m/s. ¹) Calculate the speed of the jogger. (Express your answer to three significant figures.) Submit m SFor testing purposes, a musical instrument manufacturing company creates a device so that when you blow into one end with your instrument, sound comes out the other end in opposite directions. A sound technician uses a whistle and generates sound waves with a frequency of 242 Hz. The waves travel in opposite directions in a band room, are reflected by end walls, and return. The band room is 44.0 m long and the whistle is located 14.0 m from one end. What is the phase difference (in degrees) between the reflected waves when they meet at the source of the sound? The speed of sound in air is 343 m/s.A transverse sinusoidal wave travels to the right with a wave speed 8.96 m/s. The amplitude of the wave is 0.019 m and the wavelength is 1.73 m. What is the frequency of the oscillation in Hertz?
- The electrical power needed to operate a speaker in your audio system is 18.7 W. If this speaker has a circular opening with a radius of 0.0743 m and the average sound intensity at the opening is 22.1 W/m2, determine the ratio of sound output power Psound to electrical input power Pelectrical. Psound PelectricalAn observer measured an interval of 10 s between seeing a lightning flash and hearing thunder. If the temperature of the air was 20°C how far away was the source of airAn X-ray machine makes an image of the internal organs by exposing the human body to the electromagnetic radiation with the wavelength of 10^-10 m. We call this electromagnetic radiation X-rays. Assuming that the speed of light is 3x10^8 m/s, what is the frequency of oscillations of the X-rays? Express your answer in Hertz (Hz).