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提问人：网友threven 发布时间：2022-01-07

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Sunlight reaches us by radiation. Radiation travel...

Sunlight reaches us by radiation. Radiation travels in electromagnetic waves consisting of ______, and when the energy waves reach an object, they can either pass through it, or be reflected, or be absorbed, depending on the material. PVs are made out of a semi-conducting material. When they absorb photons of sunlight, the energy of the photons dislodges electrons from their atoms. The PV’s special coating attracts free electrons to the surface, and it is this movement of electrons that produces the electrical current.

A、electrons

B、photons

C、neutrons

D、atoms

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更多“Sunlight reaches us by radiation. Radiation travel...”相关的问题

第1题

Light travels at a speed which is about a million times faster than the speed of sound. In

one second, light travels about 300,000km. But sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke comes from his gun before the sound reaches your ears.

This great speed of light gives us some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light left the moon 1.3 seconds before it reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some case, the light from one of tonight's stars started on its journey to you before you were bola.

Thus, if you want to be honest, you cant say" The stars are shining to night"？ You have to say "The stars look pretty. They were shining four years ago but their light has just reached Earth".

Sunlight seems to ______ than the light of the moon.

A．have to travel a greater distance

B．move less quickly

C．travel much quickly

D．be less powerfull

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第2题

A large ______of the sunlight never reaches the earth while infra-red heat given off by th

e earth is allowed to escape freely.

A．proportion

B．ratio

C．rate

D．fraction

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第3题

完成下列各题 B Light travels at a speed which is about a million

times faster than the speed of sound．In one second，light travels about 300，000km．But sound travels only 344m．You can get some idea of this difference by watching the start of a race．If you stand some distance away from the starter，you can see smoke comes from his gun before the sound reaches your ears． This great speed of light gives US some strange facts．Sunlight takes about 8 minutes to reach US．If you look at the light of the moon tonight，remember that the light left the moon 1．3 seconds before it reached you．The nearest star is so far away that the light which you can see from it t0—night started to travel towards you four years ago at a speed of nearly 2 million km per minute．In some case，the light from one of tonight’s stars started on its journey to you before you were born． Thus，if you want to be honest，you cant say“The stars are shining to night”？You have to say“The stars look pretty．They were shining four years ago but their light has just reached Earth”． Sunlight seems to________than the light of the moon．

A.be less powerfull

B.travel much quickly

C.move less quickly

D.have to travel a greater distance

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第4题

听力原文： We experience different forms of the Sun's energy every day. We can see its ligh

t and feel its warmth. The Sun is the major source of evaporation of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food. These green plants then provide food for all organisms on the Earth.

Much of the energy that comes from the Sun never reaches the Earth's surface. It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere, 30% is reflected by clouds or the Earth's surface. The remaining 70% warms the surface of the planet, causes water to evaporate, and provides energy for the water cycle and weather. Only a tiny part, approximately 0.023%, is actually used by green plants to produce food.

Many gases found in the atmosphere actually reflect heat energy escaping from the Earth's surface back to the Earth. These gases act like the glass of a greenhouse in that they allow energy from the Sun to enter but prevent energy from leaving. They are therefore called greenhouse gases.

When sunlight strikes an object, some of the energy is absorbed and some is reflected. The amount reflected depends on the surface. For example, you've probably noticed how bright snow is when sunlight falls on it. Snow reflects most of the energy from the Sun, so it contributes to the low temperatures of winter. Dark-colored surfaces, such as dark soil or forest, absorb more energy and help warm the surrounding air.

What is the major source of evaporation of water from the oceans and lakes？

A．The moon.

B．The sun.

C．The star.

D．The earth.

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第5题

The offer is firm subject ____ before October 1.A. for your reply reaches usB. for your

The offer is firm subject ____ before October 1.

A. for your reply reaches us

B. for your reply reaching us

C. to our receiving your reply

D. to your reply reaching us

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第6题

We experience different forms of the sun's energy every day. The sun is the major source o

f energy for our planet. It causes the evaporation(蒸发)of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food.

Much of the energy that comes from the sun never reaches the earth's surface. It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere, 30% is reflected by clouds or the earth's surface. The remaining 70% warms the surface of the planet, causes water to evaporate, and provides energy for the water cycle and weather. Only a tiny part, approximately 0.023%, is actually used by green plants to produce food.

Many gases found in the atmosphere actually reflect heat energy escaping from the earth's surface back to the earth. These gases act like the glass of a greenhouse in that they allow energy from the sun to enter but prevent energy form. leaving. They are therefore called greenhouse gases.

When sunlight strikes an object, some of the energy is absorbed and some is reflected. The amount reflected depends on the surface. Dark-colored surfaces, such as dark soil or forest, absorb more energy.

According to the passage, the root cause for weather changes on the earth is

A．the atmosphere surrounding the earth

B．water from oceans and lakes

C．energy from the sun

D．greenhouse gases in the sky

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第7题

Building this road will ______ the construction of ten bridges, and then the total cost re

aches million US dollars.

A．evolve

B．involve

C．revolve

D．devolve

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第8题

Please see that your written confirmation _____ by the end of this month; otherwise we

will be free from the obligation for his offer.

A reaches us

B will reach us

C reach us

D reached us

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第9题

Which of the following statement is TRUE？A．Light of the stars reaches us in 8.5 minutes.B．

Which of the following statement is TRUE？

A．Light of the stars reaches us in 8.5 minutes.

B．Stars travel at a speed of 300,000 kilometers a second.

C．The sun is the farthest star in the universe.

D．None of the stars we see now are the same as they used to be.

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第10题

Building this road will ______ the construction of ten bridges, then the total cost reache

s 1 million US Dollars.

A．evolve

B．involve

C．revolve

D．devolve

点击查看答案

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