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4 years ago

Why does a glass rod become positively charged when it is rubbed with a silk cloth?

1 answer:

4 0

The electrons are removed from the rod and transferred to the silk cloth. This leaves the rode positively charged and the cloth negatively charged.

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If the frequency of the 13C signal of TMS is 201.16 MHz, the two 13C signals of acetic acid at 179.0 and 20.0 ppm are separated

Lelu [443]

The difference in frequency of the two signals is $1.33 \times 10^{10} \ kHz$ .

The given parameters;

<em>frequency of the 13 C signal = 201.16 MHz</em>

The energy of the 13 C signal located at 20 ppm is calculated as follows;

$E = hf\\\\E_1 = h \frac{c}{\lambda} \\\\E_1 = \frac{(6.626 \times 10^{-34})\times 3\times 10^8}{20 \times 10^{-6}} \\\\E_1 = 9.94 \times 10^{-21} \ J$

The energy of the 13 C signal located at 179 ppm is calculated as follows;

$E_2 = \frac{hc}{\lambda} \\\\E_2 = \frac{(6.626\times 10^{-34})\times (3\times 10^{8})}{179 \times 10^{-6} } \\\\E_2 = 1.11 \times 10^{-21} \ J$

The difference in frequency of the two signals is calculated as follows;

$E_1- E_2 = hf_1 - hf_2\\\\E_1 - E_2 = h(f_1 - f_2)\\\\f_1 - f_2 = \frac{E_1 - E_2 }{h} \\\\f_1 - f_2 = \frac{(9.94\times 10^{-21}) - (1.11 \times 10^{-21})}{6.626\times 10^{-34}} \\\\f_1 - f_2 = 1.33 \times 10^{13} \ Hz\\\\f_1 - f_2 = 1.33\times 10^{10} \ kHz$

Thus, the difference in frequency of the two signals is $1.33 \times 10^{10} \ kHz$ .

Learn more here:brainly.com/question/14016376

4 0

3 years ago

Which of these will cause the highest tides? A. when the Sun, Moon and Earth are in a straight line B. when all of the planets a

marusya05 [52]

Answer:

A. when the Sun, Moon and Earth are in a straight line

Explanation:

The highest tide is formed when the sun, moon, and also the earth are in alignment. This high tide is known as spring tides.

Spring tides happen when we have a new moon or a full moon. With the earth, sun and moon aligning. We have lunar and solar tide forming a reinforcement with each other causing high tides or extreme tides. we have collectively, their gravitational pull on water of the earth to become stronger

5 0

3 years ago

How many sides does a rectangle have

andrezito [222]

Answer:

4 sides

Explanation:

Hope it helps you.

4 0

3 years ago

Read 2 more answers

What is the area of soft cartilage where bone growth occurs

VladimirAG [237]

The area of <span>the epiphyseal plate belonging from a soft cartilage is where bone growth usually begins. The production of bones inside this tissue is due to a cell division by mitosis. In addition, this process of producing bone material to replace old bone structures is called ossification.</span>

6 0

4 years ago

If the output work of a simple machine is ____ than the input work, the machine is said to have less than 100% efficiency.

bearhunter [10]

Less than. A machine should have equal or more output than input to have a high efficiency. :)

6 0

3 years ago