A portable radio is sitting at the edge of a balcony 7.54 m above the ground. The unit is emitting sound uniformly in all directions. By accident, it falls from rest off the balcony and continues to play on the way down. A gardener is working in a flower bed directly below the falling unit. From the instant the unit begins to fall, how much time is required for the sound intensity level heard by the gardener to increase by 10.0 dB? Number i Units

In each of the four scenarios shown in the images, a large bat lets out a short burst of ultrasonic sound, which a smaller bat hears a moment later. If the large bat flies at 2.320 m/s and the small bat flies at 13.80 m/s, order the frequencies that the smaller bat detects in the four scenarios from highest to lowest. Assume that the speed of sound is 343.0 m/s. Highest frequency A D B. A B C Lowest frequency Answer Bank In Scenario C, part of the large bat's signal reflects off the small bat and returns to the large bat, warning it of the smaller bat's presence. If the initial signal has a frequency of 66.70 kHz, what return frequency fr will the large bat detect? Calculate the final frequency to four significant figures. fr Incorrect kHz Ꭰ

A source emits sound waves isotropically. The intensity of the waves 1.80 m from the source is 2.30 x 10-4 W/m². Assuming that the energy of the waves is conserved, find the power of the source. Number i Units

Subject; physic

d to go Key Idea Stock of Data Solution Sanity Check 2. A 3 Hz wave has a wavelength of 0.4 m. Calculate the speed of the wave (in m/s). Physics-Problem Solving Entries Key Idea Stock of Data Q Search Solution Sanity Check

When you are standing a distance r1 from a point source of sound, the sound intensity level is β1. When you move away from the source to a new distance r2, the sound intensity level drops to β2=β1 - 3 dB. Determine r2/r1.

You may want to review (Page). For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Temporary deafness. Part A Find the intensity (in W/m²) of a 54.0 dB sound. I₁ = 2.51×10-7 W/m² Submit Previous Answers ✓ Correct Set Up: ß = 10 log (1) with Io - " 1.00 × 10-¹2 W/m². If x = log y and To 1/10 Solve: 3 = 54.0dB gives 5.40 = log (1) I = (2.5 × 105) (1.00 × 10-¹²W/m²) = 2.51 × 10-7W/m² = 105.40 = then = Y 2.5 × 105. 10%.

Chapter 17, Problem 020 The figure shows four isotropic point sources of sound that are uniformly spaced on an x axis. The sources emit sound at the same wavelength and same amplitude sm, and they emit in phase. A point P is shown on the x axis. Assume that as the sound waves travel to P, the decrease in their amplitude is negligible. What multiple of sm is the amplitude of the net wave at P if distance d in the figure is (a)1A, (b)2, and (c)4/? (a) Number (b) Number (c) Number Units Units Units S₁ Sa Sa + S₁

A string with a linear density of 9 kg/m is stretched to a length of 1.8 meters and fastened at both end so that it can freely vibrate. The tension on the string is 1100 Newtons.At what speed would a wave propagate on this string? m/s

Problem 12 please