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o-na [289]
3 years ago
13

A beam of light has a wavelength of 4.5 x10^-7 meter in a vacuum. the frequency of this light is

Physics
1 answer:
valkas [14]3 years ago
3 0
The basic relationship between frequency and wavelength for light (which is an electromagnetic wave) is
c= f \lambda
where c is the speed of light, f the frequency and \lambda the wavelength of the wave. 
Using \lambda=4.5 \cdot 10^{-7} m and c=3 \cdot 10^8 m/s, we can find the value of the frequency:
f= \frac{c}{\lambda}= \frac{3 \cdot 10^8 m/s}{4.5 \cdot 10^{-7} m}=6.7 \cdot 10^{14} Hz
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Answer:

a = -4/5 m/s^2

Explanation:

Acceleration = change in velocity / time

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a = (20 m/s - 60 m/s) / 50 s

a = -40 m/s / 50 s

a = -4/5 m/s^2

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7 0
1 year ago
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8 0
2 years ago
A device called an insolation meter is used to measure the intensity of sunlight. It has an area of 100 cm2 and registers 6.50 W
labwork [276]

Answer:

<h2>650W/m²</h2>

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Intensity of the sunlight is expressed as I  = Power/cross sectional area. It is measured in W/m²

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Before we calculate the intensity, we need to convert the area to m² first.

100cm² = 10cm * 10cm

SInce 100cm = 1m

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3 years ago
What happens when a substance absorbs light?
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