Answer:
t = 0.731s
Explanation:
In order to calculate the time that the capacitor takes to have a voltage of 70V, you use the following formula:
(1)
V: final voltage across the capacitor = 70V
Vo: initial voltage across the capacitor = 100V
R: resistance of the resistor in the circuit = 1kΩ = 1*10^3Ω
C: capacitance of the capacitor = 2mF = 2*10^-3F
t: time
You use properties of logarithms to solve the equation (1) for t:
Next, you replace the values of the parameters:
The capacitor takes 0.731s to reache a voltage of 70V
Answer:
Sapphire and diamond impurities change with their transparency and role of impurities in dielectrics is discussed below.
Explanation:
Temperature dependence of the dielectrics with different degrees of purity measured in the range of 233-313 K. This was observed that the impurities presence is strongly influences the dielectric constant, dipole moment and melting point.
SAPPHIRE
Sapphire is a very important gem stone. It's color is blue, but the naturally occurring sapphires have purple, yellow,orange and green. This variety in color is due to trace amount of presence of impurities like Iron,titanium, chromium, copper and Magnesium. It is the third hardest materials in the Mohs scale. The transparency of Sapphire is due to the impurities present in it.
DIAMOND
Diamond is the very precious stone. The transparency in the diamond is due to the band structure, that is the band gap is high in the diamonds, so they are transparent in nature. Diamond has many unequaled qualities and is very unique among the other minerals. It has highest refractive index of any natural minerals and is transparent over greatest number of wavelengths due to conduction present in it.
The higher the frequency, the higher or sharper (the musical term if you prefer such things) the pitch is.
Answer:
Doppler effect to analyze the motion and properties of the star and planet.
Explanation:
The radial velocity method invovles watching the spectral lines of a star as a planet orbits around the star. Because of the planets gravitational pull on the star, will wobble. This causes Doppler shifts in the spectral lines, allowing astronomers to infer the presence of the planets.
Answer:
metal
Explanation:
sound can travel best in materials with higher elastic properties like metal than it can through other solids like plastic or rubber which have lower elastic properties
I hope this helps