Is the erbium transparent, translucent or opaque?
1 answer:
Objects that allow all of the light to pass through them is said to be transparent. One can clearly see through the transparent objects. Objects that allow only some light to pass through them is said to be translucent. One can partially see through the translucent objects whereas objects that do not allow any light to pass through them is said to be opaque. One cannot see through the opaque objects at all.
Erbium is a chemical element with atomic symbol, which belongs to the period 6 with atomic number 68. It is a lanthanide, which is silvery-white solid metal in nature. The metals are opaque to visible lights.
Hence, erbium is opaque.
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The mass of a sample of alcohol is found to be = m = 367 g
Hence, it is found out that by raising the temperature of the given product, the mass of alcohol would be 367 g.
Explanation:
The Energy of the sample given is q = 4780
We are required to find the mass of alcohol m = ?
Given that,
The specific heat given is represented by = c = 2.4 J/gC
The temperature given is ΔT = 5.43° C
The mass of sample of alcohol can be found as follows,
The formula is c =
We can drive value of m bu shifting m on the left hand side,
m =
mass of alcohol (m) =
m = 367 g
Therefore, The mass of the given sample of alcohol is
m = 367g
It requires 4780 J of heat to raise the temperature by 5.43 C in the process which yields a mass of 367 g of alcohol.
Answer:
According to the following position vs. Time graph the bicyclist was : D
D. Not moving for the first two seconds, then begin moving at the constant speed.
Explanation:
Along Y-axis = Distance in meters
Along X-axis = Time taken in second
- For first 2 seconds the The object has not changed its position.There is Zero distance covered.So , Speed = 0
- After 2 second,The Object changed the distance by equal amount in equal interval of time.(Uniform Speed).Hence at each point after 2 second, there is same value speed