All categories

3 years ago

What are examples of conversion of energy?

1 answer:

3 0

A toaster draws electric current ( electrical energy) from a wall outlet and converts these moving electric charges into heat (thermal energy) in the filaments that turn red hot to cook your toast. I hope that helps you

You might be interested in

Pure silicon (EBG = 1.1 eV) is used as a photon detector. An incoming photon can strike the surface and excite electrons from th

Agata [3.3K]

Answer:

Explanation:

Complete Question:

A.Compute no of electrons you expect to count if silicon detector is struck with a 1.04 Mev gamma ray produced in a decay of 136 Cs nucleus.

b.Explain counting of electrons is more precise as the detector is cooled well below room temperature

Answer:

Gamma ray energy = $Cs^{135}=1.04 Mev$

photon strikes the surface excite the electrons to move from valence band to conduction band where then counted by detector.

energy gap between valence band and conduction band in case of silicon = 1.1 eV

The minimum amount of energy required is 1.1 ev

minimum number of electron counted is = $\frac{1.04 Mev}{1.1eV/electrom}$

= $0.945\times10^{6}$

In the case of semi conductors

forbidden energy gap in inversely proportional to temperature

with decrease in temperature forbidden energy gap increases,hence electrons jumping from valence band to conduction band decreases and hence counting by detector decreases

7 0

4 years ago

50 grams of ice cubes at -15°C are used to chill a water at 30°C with mass mH20 = 200 g. Assume that the water is kept in a foam

Arada [10]

Answer : The final temperature is, $25.0^oC$

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$

$m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)$

where,

$c_1$ = specific heat of ice = $2.09J/g^oC$

$c_2$ = specific heat of water = $4.18J/g^oC$

$m_1$ = mass of ice = 50 g

$m_2$ = mass of water = 200 g

$T_f$ = final temperature = ?

$T_1$ = initial temperature of ice = $-15^oC$

$T_2$ = initial temperature of water = $30^oC$

Now put all the given values in the above formula, we get:

$50g\times 2.09J/g^oC\times (T_f-(-15))^oC=-200g\times 4.184J/g^oC\times (T_f-30)^oC$

$T_f=25.0^oC$

Therefore, the final temperature is, $25.0^oC$

5 0

3 years ago

Describe in brief the importance of measurement in our daily life?<br>

Volgvan

Measurement tools make our lives safer and better? And they increase the quality and quantity of life. Arguably, the ability to measure calculating

physical properties accurately have tremendous survival value that gives humans adaptive, evolutionary advantages sharpened through many years of natural selection.

6 0

3 years ago

What is an example of total internal reflection at work?

Sunny_sXe [5.5K]

Total internal reflection occurs when a propagated wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface. <span>Total internal reflection can be observed while swimming, when one opens one's eyes just under the water's surface. If the water is calm, its surface appears mirror-like.</span>

6 0

3 years ago

The unified atomic mass unit is defined to be 1 u = 1.6605 ✕ 10−27 kg. Verify that this amount of mass converted to energy yield

katen-ka-za [31]

Answer: The energy yield is 931.5MeV

Explanation: Please see the attachments below

8 0

3 years ago

Read 2 more answers