Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. ... Ultrasound is used in many different fields.
<em>Answer:</em>
Symbol = I
<em>Explanation:</em>
<em>Isotopes</em> are those substances which have same atomic number (Numbers of protons) and different masses (Number of proton + numbers of neutrons).
- Iodine also have many isotopes like
<em>Iodine-125</em> that contain 53 protons, 72 neutrons.
<em>Iodine-128</em> that contain 53 protons, 75 neutrons.
<em>Iodine-129 </em> that contain 53 protons, 76 neutrons.
<em>Iodine-131</em> that contain 53 protons, 78 neutrons.
<em>Summary:</em>
- Here the Iodine-131 is correct answer of this question.
Answer:
![\boxed{\text{18.2 kJ}}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Ctext%7B18.2%20kJ%7D%7D)
Explanation:
The formula for the heat involved is
![q = m\Delta_{\text{f}}\text{H}](https://tex.z-dn.net/?f=q%20%3D%20m%5CDelta_%7B%5Ctext%7Bf%7D%7D%5Ctext%7BH%7D)
Data:
m = 115 g
![\Delta_{\text{f}}\text{H} = \text{158.3 J/g}](https://tex.z-dn.net/?f=%5CDelta_%7B%5Ctext%7Bf%7D%7D%5Ctext%7BH%7D%20%3D%20%5Ctext%7B158.3%20J%2Fg%7D)
Calculation:
![q = \text{115 g} \times \dfrac{\text{158.3 J}}{\text{1 g}}\\\\q = \text{18 200 J} = \textbf{18.2 kJ}}\\\\\text{It takes }\boxed{\textbf{18.2 kJ}} \text{ to melt the p-xylene}](https://tex.z-dn.net/?f=q%20%3D%20%5Ctext%7B115%20g%7D%20%5Ctimes%20%5Cdfrac%7B%5Ctext%7B158.3%20J%7D%7D%7B%5Ctext%7B1%20g%7D%7D%5C%5C%5C%5Cq%20%3D%20%5Ctext%7B18%20200%20J%7D%20%3D%20%5Ctextbf%7B18.2%20kJ%7D%7D%5C%5C%5C%5C%5Ctext%7BIt%20takes%20%7D%5Cboxed%7B%5Ctextbf%7B18.2%20kJ%7D%7D%20%5Ctext%7B%20to%20melt%20the%20p-xylene%7D)
The answer is package c because each cd would cost $1.87, which is the lowest price
Answer:
Fireworks are displayed in the night sky
Explanation:
Fireworks are exothermic