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Oduvanchick [21]
2 years ago
14

What does the blackboard do when white light falls on it?​

Physics
1 answer:
shusha [124]2 years ago
5 0
Actually a black board has all colours in light or white light . So when light falls on it board absorbs all colours because all are present so no light is reflected back. That is the case, and so it will appear black as it absorbs all colours of light that fall on it .
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Helpppppppp please !!!!
agasfer [191]

Answer:

second one is correct that is right

7 0
3 years ago
A radio have a wavelength of 0.3m and travels at a speed of 300,000,000 m/s. What is the frequency of this wave?​
Ilya [14]

The frequency of the wave is 1\cdot 10^9 Hz

Explanation:

The frequency, the wavelength and the speed of a wave are related by the following equation:

c=f \lambda

where

c is the speed of the wave

f is the frequency

\lambda is the wavelength

For the radio wave in this problem,

\lambda = 0.3 m

c=300,000,000 m/s = 3\cdot 10^8 m/s

Therefore, the frequency is:

f=\frac{c}{\lambda}=\frac{3\cdot 10^8}{0.3}=1\cdot 10^9 Hz

Learn more about waves here:

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4 0
3 years ago
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KengaRu [80]
D. The number of electrons
6 0
3 years ago
33] You have long hair, you should:
Sveta_85 [38]

Answer:

B

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4 0
3 years ago
Read 2 more answers
Eating an orange enables a person to perform about 3.5x10^4 J of work. To what height does eating and orange enable a 55kg woman
crimeas [40]
Joules is a unit for work which may decomposed into N.m. Work is a quantity which is a product of force (in this case, the woman's weight) and the distance she has traveled. 
 
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Substituting the given, 
  
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Thus, the woman can climb up to 64.94 meters. 

3 0
3 years ago
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