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3 years ago

A light bulb is left on for an hour and has a power of 0.1KW. How much did it cost?

1 answer:

3 0

(0.1 KW) x (1 hour) = 1.0 kWh of energy

Cost =
<em>(1.0) x (cost of 1 kWh from that utility company in that neighborhood).</em>

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3 years ago

1. A negatively charged rod is moved near the top of a positively charged electroscope. What

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A) Moves closer together

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2 years ago

If a machine increases force it must apply the force over a long distance? True or false

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2 years ago

Can you please help me figure out the work for the missing quantities?

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2 years ago

Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed o

kobusy [5.1K]

Answer:

$\Delta \lambda=14.3\ nm$

Explanation:

It is given that,

The number of lines per unit length, N = 900 slits per cm

Distance between the formed pattern and the grating, l = 2.3 m

n the first-order spectrum, maxima for two different wavelengths are separated on the screen by 2.98 mm, $\Delta Y=2.98\ mm = 0.00298\ m$

Let d is the slit width of the grating,

$d=\dfrac{1}{N}$

$d=\dfrac{1}{900\ cm}$

$d=1.11\times 10^{-5}\ m$

For the first wavelength, the position of maxima is given by :

$y_1=\dfrac{L\lambda_1}{d}$

For the other wavelength, the position of maxima is given by :

$y_2=\dfrac{L\lambda_2}{d}$

So,

$\Delta \lambda=\dfrac{\Delta y d}{l}$

$\Delta \lambda=\dfrac{0.00298\times 1.11\times 10^{-5}}{2.3}$

$\Delta \lambda=1.43\times 10^{-8}\ m$

$\Delta \lambda=14.3\ nm$

So, the difference between these wavelengths is 14.3 nm. Hence, this is the required solution.

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2 years ago