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3 years ago

Which of the following CANNOT be determined by looking at the spectra of a star? *

Chemistry

1 answer:

Rzqust [24]3 years ago

8 0

Answer:

A:temperature

Explanation:

The temperature cannot be determined by looking at the spectra of the star due to lack of the equipment for its measurement. <em>On the other-hand, the remaining statements like the distance from earth, movement towards or away from earth can be determined.</em>

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2 years ago

you are a fireworks maker. For the safety of the workers producing the material you want to reduce the rate of reactions to prev

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Physical methods: reduce the temperature and pressure

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3 years ago

The speed of a spaceship is going warp 7.58. What is the velocity of the spaceship in cm/min. Assume 1.00 warp = 2.5 times the s

grandymaker [24]

Answer : The velocity of the spaceship is, $3408.6\times 10^{10}cm/min$

Solution :

As we are given that,

$1.00\text{ wrap }=2.5\times \text{The speed of light}$

The speed of a spaceship = 7.58 wraps

So, $7.58\text{ wrap }=7.58\times 2.5\times \text{The speed of light}$

The speed of light = $2.9979\times 10^8m/s$

Now put the value of speed of light in above expression, we get

So, $7.58\text{ wrap }=(7.58)\times (2.5)\times (2.9979\times 10^8m/s)=56.81\times 10^8m/s$

The velocity of the spaceship = $56.81\times 10^8m/s$

Now we have to convert the velocity of the spaceship m/s to cm/min.

Conversion :

(1 m = 100 cm)

(1 min = 60 sec)

The velocity of the spaceship = $(56.81\times 10^8)\times 100\times 60cm/min=3408.6\times 10^{10}cm/min$

Therefore, the velocity of the spaceship is, $3408.6\times 10^{10}cm/min$

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3 years ago

A scientist observed that in the presence of light, plants use carbon dioxide and water to make glucose and oxygen. This chemica

pav-90 [236]

Answer:

Option A, light energy from the sun

Explanation:

In the process of photosynthesis, the energy from sun in the form of light and heat is taken to undergo glycolysis and prepare glucose/starch (chemical).

Thus, the light and heat energy of sun is converted into the chemical energy.

Option B and C are incorrect because no kinetic energy or chemical energy is taken from any source.

Option D is also incorrect because heat is taken but it is not taken from the surrounding environment. The source of heat energy is sun.

Thus, only option A is correct

8 0

2 years ago