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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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A 40-kg box is being pushed along a horizontal smooth surface. The pushing force is 15 n directed at an angle of 15° below the
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Answer:

Acceleration of the crate is 0.362 m/s^2.

Explanation:

Given:

Mass of the box, m = 40 kg

Applied force, F = 15 N

Angle at which the force is applied, (\theta) = 15°

We have to find the magnitude of the acceleration.

Let the acceleration be "a".

FBD is attached with where we can see the horizontal and vertical component of force.

⇒ F_x=Fcos(\theta)          and             ⇒ F_y=Fsin (\theta)

⇒ F_x=15cos(15)                           ⇒ F_y=15sin (15)

⇒ Applying concept of  forces.

⇒ \sum F_x=F_n_e_t =F-f

⇒ F_n_e_t =F-f

⇒ ma =F-f       <em>  ...Newtons second law Fnet = ma</em>

⇒ a =\frac{F-f}{m}              

⇒ Plugging the values.

⇒ a =\frac{15cos(15)-0}{40}     <em>...f is the friction which is zero here.</em>

⇒ a =\frac{14.48}{40}

⇒ a=0.362\ ms^-^2

Magnitude of the acceleration of the crate is 0.362 m/s^2.

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