Answer:
1, their atoms have the same number of valence electron. because valence electron determine the group of elements.
Answer:
572.3 nm
Explanation:
= refractive index of the oil film = 1.48
= thickness of the oil film = 290 nm
= wavelength of the dominant color
m = order
Using the equation
![2 n_{oil} t_{oil} = (m + 0.5) \lambda](https://tex.z-dn.net/?f=2%20n_%7Boil%7D%20t_%7Boil%7D%20%3D%20%28m%20%2B%200.5%29%20%5Clambda)
For m = 0
![2 (1.48) (290) = (0 + 0.5) \lambda](https://tex.z-dn.net/?f=2%20%281.48%29%20%28290%29%20%3D%20%280%20%2B%200.5%29%20%5Clambda)
= 1716.8 nm
For m = 1
![2 (1.48) (290) = (1 + 0.5) \lambda](https://tex.z-dn.net/?f=2%20%281.48%29%20%28290%29%20%3D%20%281%20%2B%200.5%29%20%5Clambda)
= 572.3 nm
For m = 2
![2 (1.48) (290) = (2 + 0.5) \lambda](https://tex.z-dn.net/?f=2%20%281.48%29%20%28290%29%20%3D%20%282%20%2B%200.5%29%20%5Clambda)
= 343.4 nm
Hence the dominant color wavelength is 572.3 nm
Answer: 2000 watts
Explanation:
Given that,
power = ?
Weight of object = 200-N
height = 4 m
Time = 4 s
Power is the rate of work done per unit time i.e Power is simply obtained by dividing work by time. Its unit is watts.
i.e Power = work / time
(since work = force x distance, and weight is the force acting on the object due to gravity)
Then, Power = (weight x distance) / time
Power = (200N x 4m) / 4s
Power = 8000Nm / 4s
Power = 2000 watts
Thus, 2000 watts of power is needed to lift the object.
Answer:
The Sun is a natural source for visible light waves and our eyes see the reflection of this sunlight off the objects around us.
<span>Radio waves just like light waves can be reflected refracted and diffracted and polarized. The answer is True. </span>These characteristics are the common phenomena for electromagnetic (EM) waves, and Radio Waves are electromagnetic Waves so much so that they obey reflection, refraction, and diffraction.