An experimenter presents a subject with a series of tones. During each trial of the experiment, the experimenter signals the start of the trial by saying “ready,” plays the tone, and then asks whether the subject heard it. The experiment begins with a fairly loud, clearly audible tone; on each subsequent trial, the loudness of the tone is reduced at a constant rate of 10 decibels until the subject does not hear the tone. The experimenter then starts a second series of trials with a tone too low to be heard and increases the volume gradually until the subject reports hearing the tone. What is the experimenter trying to measure?Question 2Answera.difference thresholdb.perceptual defensec.absolute thresholdd.method of limits

Juliana and Asha were using a trumpet to test how sound waves travel. Juliana blew a series of notes through the trumpet, while Asha changed her location around the room in between each trial. Asha used a detector to measure how loudly Juliana was playing the trumpet. Asha put the detector right in front of the trumpet and got a reading of 80 decibels. She then opened the door and went down the hall a short distance, where she got a reading of 50 decibels. How much louder was the trumpet when Asha was standing right next to it than when she was down the hall? A. 30 times B. 300 times C. 100 times D. 1000 times

In a basic true experiment with only two conditions, you are interested in the effects of noise on completing a comprehension task. You decide to play a tape recording of very loud music to which group of participants? A. Those participants in the control condition. B. Those participants in the experimental condition. C. Those participants in another random group. D. None of these. It is a trick question

On Fig. 8.1, sketch two cycles of a sound wave that has a shorter wavelengthand agreater amplitude. [2](ii) State two changes in the sound heard from this wave compared with the original wave.1. .......................................................................................................................................2. ...............................................................................................................................

State what happens to the amplitude and the wavelength of the wave if1. the loudness of the sound is increased at constant pitch,amplitude ...................................................................................................................wavelength ................................................................................................................

State what happens to the amplitude and the wavelength of the wave if1. the loudness of the sound is increased at constant pitch,amplitude ...................................................................................................................wavelength .................................................................................................................[1]2. the pitch of the sound is increased at constant loudness.amplitude ...................................................................................................................wavelength ...................................................................................................