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3 years ago

14

Blackbody radition is white give reasons.?

1 answer:

Nimfa-mama [501]3 years ago

7 0

Answer:An object that absorbs ALL radiation falling on it, at all wavelengths, is called a blackbody. When a blackbody is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature. ... As its temperature increases further it becomes yellow, white, and ultimately blue-white

Explanation:

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What is the purpose of the Bill of Rights?

NeX [460]

Answer:

i think it is To limit the rights of individual citizens

Explanation:

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3 years ago

Which statements describe sedimentary rock? Check all that apply.

Vedmedyk [2.9K]

I don't know the choices but...

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3 years ago

Read 2 more answers

The 1.19 kg head of a hammer has a speed of 8.4 m/s just before it strikes a nail (Fig. 14-13) and is brought to rest. Estimate

KATRIN_1 [288]

Answer:

The temperature rise is $143.9\ K$ .

Explanation:

Given the mass of the hammer $(m)$ is 1.19 kg.

And the speed of the hammer $(v)$ is 8.4 m/s.

We need to find the temperature change of iron nail having 20 hammer blows.

First, we will find the kinetic energy of the each blow of hammer.

$K.E=\frac{1}{2}mv^2$

$K.E=\frac{1}{2}\times 1.19\times 8.4^2=41.99\ J$

For 20 such blows, the kinetic energy will be

$20\times K.E=20\times 41.99=839.8\ J$

Let us assume that the nail absorbs all the kinetic energy. So, this 839.8 J will be converted into heat energy $(Q)$ .

Now,

$Q=839.8\ J$

Also, we know that

$Q=mc\Delta_T$

Where,

$m$ is the mass of the nail, which is $13\ g=\frac{13}{1000}=0.013\ kg$

$c$ is the specific heat capacity of iron, which is 449 J/kg.K

$\Delta_T$ is the change in temperature.

Plug these value we get,

$Q=mc\Delta_T\\839.8\ J=(0.013\ kg)(449\ J/kg.K)\times\Delta_T\\\Delta_T=\frac{839.8}{0.013\times 449}\\\\\Delta_T=143.9\ K$

We can see the temperature rise is 143.9 K.

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4 years ago

All waves must travel up and down.<br><br><br> True<br><br><br> False

const2013 [10]

Answer:

True all waves that go up must come down

I feel like the follow the rule of gravity:everything that goes up must come d5

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3 years ago

2.4 What is the radiation error of a temperature measurement?<br>I

Airida [17]

Answer:

diameter of the wire = 0.05 in =0.05 /12 =4.167 *10 ^-3 ft

area of cross section of the wire = A = 22/7 * ( d /2 ) ^2 =0.786 * ( 4.167 *10 ^-3 ) ^2 =1.365 *10 ^-5 ft2

E =...

Explanation:

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3 years ago