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saw5
1 month ago
14

The wavelength of red light is about 700 nm: λred = 700 nm. Which is larger, a grain of sand (diameter roughly 0.2 mm) or a wave

of red light? How many times larger?
Physics
1 answer:
Sav [3.1K]1 month ago
3 0
The grain of sand is larger approximately 286 times. Explanation: To compare the size of the grain of sand to the wavelength of red light (about 700 nm), both measurements need to be converted into standard form using meters for easier comparison. The diameter of the sand grain shows it is indeed larger.
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"If E = 7.50V and r=0.45Ω, find the minimum value of the voltmeter resistance RV for which the voltmeter reading is within 1.0%
ValentinkaMS [3465]

Answer:

The minimum resistance value is R_V =44.552\ \Omega

Explanation:

According to the question, we have:

                  The voltage given as E = 7.5V

                  The internal resistance as r = 0.45

The goal here is to find the minimum resistance for the voltmeter such that its reading is within 1.0% of the battery's emf.

This means we require voltmeter resistance such that:

                              V = (100% - 1%) of E

Where E is the battery's e.m.f. and V is the voltmeter reading.

So, V = 99% of E = 0.99 E = 7.425.

In general, we have:

                E = V + ir

where ir denotes the internal voltage drop across the voltmeter, and V is the reading from the voltmeter.

By rearranging, we get:

            i = \frac{(E-V)}{r}

               =\frac{7.50-7.425}{0.45}

              = 0.1667 A

Since the current remains constant throughout the circuit:

                  V = iR_V

where R_V is the voltmeter resistance value.

Hence, R_V = \frac{V}{i} = \frac{7.425}{0.1667}

                                  =44.552\ \Omega

                       

8 0
2 months ago
Bradley gets an x-ray at a radiology clinic that employs its own technologists and radiologists. Would the coder at the clinic r
Maru [3345]

Answer:

Explanation:

If Bradley's examination was done and analyzed in the same facility, the radiologist code is utilized as shown for example- procedure code 72100- Radiologic examination, spine, lumbosacral, 2 or 3 views is reported.

if the X-ray was conducted by Dr. X but he doesn't interpret the results and instead passes it on to the radiologist for initial assessment, then a 26-modifier is applied. For instance, a report from the technologist would be procedure code 72050-Radiologic examination, spine, cervical, 2 or 3

views or under specific circumstances, 72050-TC and the consulting radiologist could report 72050-26.

if Bradley’s x-ray were referred to an independent radiologist for interpretation, then procedure code 76140 would be used in the reporting.

8 0
1 month ago
The Hall effect can be used to calculate the charge-carrier number density in a conductor. If a conductor carrying a current of
kicyunya [3294]

Answer:

6.6*10^{27}e/m^3

Explanation:

When calculating Hall voltage, it is crucial to have the current, magnetic field strength, length, area, and number of charge carriers available. The Hall voltage can be expressed using the equation:

V_h = \frac{iB}{neL}

Where:

i= the current

B= the magnetic field strength

L = the length

n = the number of charge carriers

e= charge of an electron

We need to replace values and solve for n:

n= \frac{iB}{V_h e L}

n= \frac{2*1.2}{4.5*10^{-6}*5^10^{-3}*1.6*10^{-19}}

n= 6.6*10^{27}electron.m^{-3}

As a result, the charge carrier density is 6.6*10^{27}e/m^3

5 0
2 months ago
A ceiling fan has five blades, each with a mass of 0.34 kg and a length of 0.66 m. The fan is operating in its "low" setting at
Yuliya22 [3333]
The cumulative rotational kinetic energy of the five blades amounts to 10.9J. Please refer to the attached documents for further information.
8 0
1 month ago
A fox locates rodents under the snow by the slight sounds they make. The fox then leaps straight into the air and burrows its no
Ostrovityanka [3204]

Response:

v = 4.08 m/s²

Clarification:

4 0
2 months ago
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