Monday Unit test: Ms Nayr's Class:

2 answers:

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1. is A 7
2. reticulated means divide or mark something in such a way as to resemble a net or network.
3. A dhole is an Asian dog that has a Sandy coat and black, bushy tail and lives in packs.

elena-14-01-66 [18.8K]2 years ago

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1.) 7, humans have the same amount of neck bones. Think of it that way

2.) It has a pattern diamond like or web like.

3.) Indian wild dog

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The H line in Calcium is normally at 396.9nm. however, in a star’s spectrum it is measured at 398,1 nm. How fast is the star mov

konstantin123 [22]

H line of Calcium spectrum is normally given as 396.9 nm

Now from a distant star we measured it as 398.1 nm

So here this change in the wavelength of distant star is due to Doppler's effect of light as per which when source of light moves towards the observer then the frequency of light received will appear different from its actual frequency

So here we can say as per Doppler's effect of light

$\frac{\Delta \nu}{\nu_0} = \frac{v}{c}$

$\frac{\nu' - \nu}{\nu_0} = \frac{v}{c}$

$\frac{\frac{1}{\lambda} - \frac{1}{\lambda'}}{\frac{1}{\lambda}} = \frac{v}{c}$

$\frac{\lambda' - \lambda}{\lambda'} = \frac{v}{c}$

given that

$\lambda' = 398.1 nm$

$\lambda = 396.9 nm$

$c = 3 * 10^8 m/s$

$\frac{398.1 - 396.9}{398.1} = \frac{v}{3*10^8}$

$v = 3*10^8 * \frac{1.2}{398.1}$

$v = 9.04 * 10^5 m/s$

so the start is moving away with speed 9.04 * 10^5 m/s because when wavelength is more than the real wavelength then its frequency is less which mean it is moving away from the Earth

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Solar-powered cars use energy from the Sun to work. A panel on the car absorbs light energy from the Sun, which then generates a

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Solar energy, electrical energy, and mechanical energy.

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How long does it take a wave to travel 1200 meters with the speed of 3 X 108m/sec?

Vladimir79 [104]

Around 3.70 seconds unless traveling through media

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