![subject](/tpl/images/cats/himiya.png)
17. which of the following describes a condition in which an individual would not hear an echo?
a. an individual is standing 30 meters in front of the reflecting surface.
b. the reflecting source is approximately 21.5 meters from the individual.
c. an individual is standing in the range of the sound waves coming from the original sound source as well as the reflected waves.
d. a sound wave reaches the ear and the reflected wave reaches the ear less than 0.1 second later.
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 21.06.2019 20:30
An exothermic reaction is conducted in an insulated calorimeter filled with water. the calorimeter is then sealed so that there is no heat exchanged between the contents of the container and the surrounding air. which of the following statements is true about the reaction?
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 01:00
Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 11:30
Which statement best describes the flow of energy in this scenario
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 15:00
20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?
Answers: 2
You know the right answer?
17. which of the following describes a condition in which an individual would not hear an echo?
Questions
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/health.png)
Health, 04.11.2020 05:40
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 04.11.2020 05:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 04.11.2020 05:40
![question](/tpl/images/cats/mat.png)
Mathematics, 04.11.2020 05:40
![question](/tpl/images/cats/mat.png)
Mathematics, 04.11.2020 05:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/ap.png)
Advanced Placement (AP), 04.11.2020 05:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/User.png)
Engineering, 04.11.2020 05:40
![question](/tpl/images/cats/mat.png)
Mathematics, 04.11.2020 05:40
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 04.11.2020 05:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 04.11.2020 05:40