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2 years ago

6

If a 160W light bulb consumes 1000J of electrical energy in a given time, then in the same time interval, how much energy will a

40W light bulb consume?

2 answers:

NNADVOKAT [17]2 years ago

7 0

160w/4 = 40w
1000J/ 4= 250J
a 40w light bulb will consume 250J

kodGreya [7K]2 years ago

7 0

Answer:250J

Explanation:

160*t=1000

40* 1000/160= 250

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2 years ago

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Given:

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Now, to calculate the de-Broglie wavelength of the electron, $\lambda_{e}$ :

$\lambda_{e} = \frac{h}{p_{e}}$

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where

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Now,

Kinetic energy of an electron = thermal kinetic energy

$\frac{1}{2}m_{e}v_{e}^{2} = \frac{3}{2}k_{b}T$

$}v_{e} = \sqrt{2\frac{\frac{3}{2}k_{b}T}{m_{e}}}$

$}v_{e} = \sqrt{\frac{3\times 1.38\times 10^{- 23}\times 1800}{9.1\times 10_{- 31}}}$

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Using eqn (2) in (1):

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$\lambda_{p} = \frac{h}{m_{p}{v_{p}}$ (3)

where

$m_{p} = 1.6726\times 10_{- 27} kg$ = mass of proton

$v_{p}$ = velocity of an proton

Now,

Kinetic energy of a proton = thermal kinetic energy

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