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2 years ago

15

Explain how the cell membrane controls the movement of materials into and out of the cell ?

1 answer:

sukhopar [10]2 years ago

5 0

It's called simple diffusion, the small molecules without charges such as oxygen and carbon dioxide can flow through a plasma membrane without assistance and without expending energy. Other substances such as proteins, glucose and charged particles called ions cannot pass through the selectively permeable membrane.

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How many significant figures in 11 soccer players

maria [59]

Counting gives an exact number and exact numbers have infinite sig figs.

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3 years ago

What is the energy in joules of one photon of<br> microwaveradiation with a wavelength 0.122m?

pentagon [3]

<u>Answer:</u> The energy of photon is $162.93\times 10^{-26}J$

<u>Explanation:</u>

The relation between energy and wavelength of light is given by Planck's equation, which is:

$E=\frac{hc}{\lambda}$

where,

E = energy of the light = ?

h = Planck's constant = $6.626\times 10^{-34}Js$

c = speed of light = $3\times 10^8m/s$

$\lambda$ = wavelength of photon = 0.122 m

Putting values in above equation, we get:

$E=\frac{(6.626\times 10^{-34}Js)\times (3\times 10^8m/s)}{0.122m}\\\\E=162.93\times 10^{-26}J$

Hence, the energy of photon is $162.93\times 10^{-26}J$

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