Photons emitted from the surface of the Sun need to travel across the vacuum of space to reach our eyes. The transfer of energy from the sun across nearly empty space (vacuum) is accomplished primarily by radiation. Radiation is the transfer of energy by electromagnetic wave motion. Once the sun’s energy reaches earth, it is intercepted first by the atmosphere. A small part of the sun’s energy is directly absorbed, particularly by certain gases such as ozone and water vapor. Some of the sun’s energy is reflected back to space by clouds and the earth’s surface.
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Answers:</h2>
The energy of a photon is given by the following formula:
(1)
Where:
is the Planck constant
is the frequency
Now, the frequency has an inverse relation with the wavelength :
(2)
Where is the speed of light in vacuum
Substituting (2) in (1):
(3)
<u>Knowing this, let's begin with the answers:
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<h2>(a) Microwave: 50.00 cm
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For
<h2>(b) Visible: 500 nm
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For
<h2>(c) X-ray: 0.5 nm
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For
As we can see, as the wavelength decreases, the energy increases.
Answer:Half-life is the amount of time it takes for the initial mass of the isotope to decompose, by half, into other lighter atoms.
Explanation:Different radioactive isotopes have different half-lives. For example, the element technetium-99m has a half life of 6 hours. This means that is 100 kg of the element is left to decay, in 6 hours, 50kg of the mass will have changed into other elements/atoms. The half-life of uranium-238 is 4.5 billion years while that of polonium-216 is only 0.145 seconds.
the answer was C because Heat is transferred by conduction when a hot object is in direct contact with a cold object. So, a metal spoon becoming warm when placed in a cup of hot tea is an example of conduction because the spoon gains heat by being in direct contact with the hot tea.
Answer:
force makes an object move