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3 years ago

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

(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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A brick has a mass of 562 g and a volume of 43 cm3. What is the density?

alexgriva [62]

Answer:

13.069 g/cm^3

Explanation:

to get density, simply divide the mass by the volume. Your equation would look like this; p=562/43

'P' represents density in this equation. Never forget to add your units!

Hope this helps!

3 0

3 years ago

A hiker walks due east for a distance of 25.5 km from her base camp. On the second day, she walks 41.0 km northwest till she dis

GarryVolchara [31]

Resultant displacement is 29.2 km at $83.1^{\circ}$ north of west

Explanation:

To solve the problem, we have to use the rules of vector addition, resolving first each vector along the x- and y- direction.

Taking east as positive x direction and north as positive y- direction, we have:

- First displacement is 25.5 km east, therefore its components are

$A_x = 25.5 km\\A_y = 0 km$

- Second displacement is 41.0 km northwest, so its components are

$B_x = (41.0)cos(135^{\circ})=-29.0 km\\B_y =(41.0)sin(135^{\circ})=29.0 km$

So, the components of the resultant displacement are

$R_x=A_x+B_x=25.5+(-29.0)=-3.5 km\\R_y=A_y+B_y=0+29.0=29.0 km$

And so, the magnitude is calculated using Pythagorean's theorem:

$R=\sqrt{R_x^2+R_y^2}=\sqrt{(-3.5)^2+(29.0)^2}=29.2 km$

And the direction is given by

$\theta=tan^{-1}(\frac{R_y}{|R_x|})=tan^{-1}(\frac{29.0}{3.5})=83.1^{\circ}$

Where the angle is measured from the west direction, since Rx is negative.

Learn more about displacement:

brainly.com/question/3969582

#LearnwithBrainly

3 0

3 years ago

Help for physics

12345 [234]

Answer:

A. 5 m/s

Explanation:

From the graph, for the first 2 seconds, the graph is a straight line meaning that the slope is a constant.

Average speed of an object is the rate of change of position. Here, the position of the object changes from 0 m to 10 m for a time interval of 2 seconds.

The change in position ( $\Delta x$ ) and time interval ( $\Delta t$ ) are given as:

$\Delta x=10-0=10\ m\\\Delta t=2-0=2\ s$

Therefore, the average speed ( $s_{avg}$ ) is given as the ratio of the total change in position and the time interval for the change.

$s_{avg}=\frac{\Delta x}{\Delta t}=\frac{10-0}{2-0}=\frac{10}{2}=5\ m/s$

Hence, the average speed is 5 m/s.

8 0

3 years ago

Read 2 more answers

100 grados a revoluciones

djyliett [7]

No. Quatro cientos grads.

6 0

3 years ago

The emission spectra you obtained from a star show a hydrogen spectrum that is shifted toward the blue end of the electromagneti

kvasek [131]

Answer:

The correct option is;

The star is moving toward Earth.

Explanation:

The shifting of the wavelength of light wave toward the blue end of the electromagnetic spectrum is termed blue shift.

A blue-shift of an electromagnetic wave corresponds to the wavelength decrease of the wave, which is equivalent increase in energy, resulting in an increase in the observed frequency of the wave.

Astronomers make use of the shifting of the wavelength of a wave to understand the relative motion of galaxies.

The wavelength of an approaching electromagnetic ave shifts towards the blue end of the electromagnetic spectrum because the wavelength is shorter.

The opposite of phenomenon is red-shift.

4 0

3 years ago