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3 years ago

Why blue light elicits a positive phototropic?

1 answer:

3 0

Phototropism is the growth of an organism which responds to a light stimulus. It is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs. This causes the plant to have elongated cells on the farthest side from the light.

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As police car with a blaring siren driver away from you while are on standing near intersection, the frequency of the siren is _

mr_godi [17]

Through the principle or law of Doppler effect, it can be deduced that when the object is approaching one that is stationary, its frequency is increasing. Frequency and pitch are two items which are in direct proportion. This means that a higher frequency sound corresponds to a higher pitch.

Hence, the answer to this item is letter E. higher, higher.

5 0

3 years ago

Please help me . i need to answer it asap thankyou

alex41 [277]

The amount of heat needed to melt the block of lead is $5.4\cdot 10^4 J$

Explanation:

The amount of heat needed to melt a solid substance already at its melting point is given by the equation

$Q=m \lambda_f$

where

m is the mass of the substance

$\lambda_f$ is the specific latent heat of fusion

In this problem, we have a block of lead already at its melting point, $327^{\circ}C$ . Its mass is

m = 200 g = 0.2 kg

and its specific latent heat of fusion is

$\lambda_f = 2.7\cdot 10^5 J/kg$

Therefore, the amount of heat needed for the block to completely melt is

$Q=(0.2)(2.7\cdot 10^5)=5.4\cdot 10^4 J$

Learn more about specific heat:

brainly.com/question/3032746

brainly.com/question/4759369

#LearnwithBrainly

8 0

3 years ago

A traveling periodic wave passes a point of observation. At this point, the time between successive crests is 0.2s. What can you

Aleks04 [339]

The time between the successive crusts will give the time period of the wave.

So, the time period, T of the given wave is 0.2 s.

The frequency of a wave is the reciprocal of its time period. That is,

Frequency, ν = $\frac{1}{T}$

= $\frac{1}{0.2}$

= 5 Hz

Thus, the frequency of the given travelling periodic wave is 5 Hz.

3 0

3 years ago

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How can humans increase the rate of endangered of extinct species

labwork [276]

I would think A. Reduce Environmental Impacts.

If you build and populate more zoos, some of the endangered species might not be able to survive in captivity

If you introduce new predators they are going to kill all the endangered species and if you pass new laws about land use some people may kill the species

5 0

4 years ago

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What is the work energy transfer equation?

rosijanka [135]

Answer:

The equation used to calculate the work done is: work done = force × distance. W = F × d. This is when: work done (W) is measured in joules (J)

8 0

3 years ago

Read 2 more answers