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Mrrafil [7]
3 years ago
7

You are heating two chunks of metal of the same size and shape. One is made of lead and is heated

Physics
1 answer:
olga55 [171]3 years ago
8 0

Answer:

This question is incomplete without the options but the options are provided below

(a) the two spectra peak at the same wavelength

(b) the spectra cannot be compared because they come from different materials

(c) The lead spectrum peak is at a shorter wavelength than the iron spectrum peak

(d) the lead spectrum peak is at a longer wavelength than the iron spectrum peak

The correct option is c

Explanation:

This question on quantum physics seek to test our knowledge of Wien's displacement law which states that when different temperatures (in kelvin) of a black body radiator increases, they will peak at different wavelengths which are inversely proportional to the temperature. Hence, <u>an increase in temperature of a black-body object will peak at a shorter wavelength than the other black-body object with a lesser temperature; since the lead was heated to 400 K, it's spectrum will peak at a shorter wavelength than that of iron which was heated to 350 K.</u>

Hence, the correct option is c

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Many minerals, such as silver, are good conductors of heat and electricity. How could technology use this property to help ident
Aleks [24]

Answer:

This property could be used to create technologically-advanced tools or machines that could easily locate the mineral deposits.

Explanation:

Mineral deposits are hard to find, unless you have the skill or the proper tools in locating them. This is the reason why many people are mining in order to explore the different areas where they could find these deposits.

If one would consider the property of minerals, such as being good conductors of heat and electricity,<u> then they could create a tool or machine that would aid in their exploration.</u> Inventors could probably come up with a sensitive detector which signals when it reaches an area of high heat and electric conductivity. Since most minerals such as <em>gold, silver, copper, galena, bornite </em>and the like have this property, then miners will have a lesser amount of time looking for them.

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3 years ago
A fully loaded cart with a mass of 2200 kg starts from the top of a 12-meter hill on a roller coaster.
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Answer:

A. potential energy is 258720 Joule

Explanation:

A.Gravitational potential energy is: PE = m × g × h

velocity =  15.33 m/s when the car reaches the bottom of the hill.

where, m = mass

            g = acceleration due to gravity

            h = height from the bottom of hill.

The potential energy is : m×g×h

                                     =(2200×9.8×12)

                                     =258720 Joule

B. at the bottom of the hill, the potential energy is converted into kinetic energy so PE at top = KE at bottom

                    kinetic energy= \frac{1}{2}(m*v^{2})

where v = velocity

          m= mass

therefore,               v=\sqrt\frac{2*K.E}{m} {}

                         or,  v=\sqrt{\frac{2*258720}{2200} }

                         or,   v=15.33 m/s

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