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RoseWind [281]
4 years ago
9

Red light has a longer wavelength and higher energy than blue light. True or False

Physics
1 answer:
Bingel [31]4 years ago
8 0

Answer:

False

Explanation:

Visible light is composed of radiation of wavelengths between 400 and 700 nm. The sensitivity of the human eye depends on the wavelength and has a maximum at 550 nm. Some people are able to perceive from 380 to 780 nm.

The electromagnetic energy in a particular wavelength λ (in a vacuum) has an associated frequency f and a photonic energy E. Thus, the electromagnetic spectrum can be expressed in terms of any of these three variables, which are related by equations.

Thus, high frequency electromagnetic waves have a short wavelength and high energy; Low frequency waves have a long wavelength and low energy.

To calculate the energy of a photon the Planck formula is used is E = h · v, where E is the energy, h the Planck constant and v the frequency (Hz or s-1).  Where the frequency f is equal to the speed of the wave, divided by the wavelength λ .

That said we can say that it is false because although the red light has a longer wavelength than the blue one, in turn it has a lower energy than the blue light.

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Potassium is a crucial element for the healthy operation of the human body. Potassium occurs naturally in our environment and th
Mariulka [41]

Answer:

a) 0.0288 grams

b) 2.6*10^{-10} J/kg

Explanation:

Given that:

A typical human  body contains about 3.0 grams of Potassium per kilogram of body mass

The abundance  for the three isotopes are:

Potassium-39, Potassium-40, and Potassium-41 with abundances are 93.26%, 0.012% and 6.728% respectively.

a)

Thus; a person with a mass of 80 kg will posses = 80 × 3 = 240 grams of potassium.

However, the amount of potassium that is present in such person is :

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= 0.012/100 × 240 grams

= 0.0288 grams

b)

the effective dose (in Sieverts) per year due to Potassium-40 in an 80- kg body is calculate as follows:

First the Dose in (Gy) = \frac{energy \ absorbed }{mass \ of \ the \ body}

= \frac{1.10*10^6*1.6*10^{-14}}{80}

= 2.2*10^{-10} \ J/kg

Effective dose (Sv) = RBE × Dose in Gy

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Effective dose (Sv) = 2.6*10^{-10} J/kg

 

5 0
4 years ago
A small diameter lead ball and a large diameter rubber ball are dropped from a tower. The balls hit the ground at the same time.
Gekata [30.6K]

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A) No conclusion can be drawn without more information about the two balls.

Explanation:

8 0
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The mass of the motorbike and rider is 286 kg. Calculate the acceleration of the motorbike at this moment in time.
Aleks04 [339]

Answer:

a=4.03\ m/s^2

Explanation:

Given that,

The mass of the motorbike and rider is 286 kg.

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F = 2000 N - 845 N = 1155 N

Let a be the acceleration of the motorbike. So,

a=\dfrac{F}{m}\\\\a=\dfrac{1155}{286}\\\\a=4.03\ m/s^2

So, the acceleration of the motorbike is 4.03\ m/s^2.

7 0
3 years ago
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