A. You are exposed to nuclear radiation every day.
Answer:
Explanation:
sound level scale is logarithmic which is given by the following formula
L = 10 log I / I₀ where I₀ = 10⁻¹² W / m² s
80 = 10 log I / 10⁻¹²
8 = log I / 10⁻¹²
I / 10⁻¹² = 10⁸
I = 10⁻⁴ W / m² .s
for three person the intensity becomes three times ie
3 x 10⁻⁴
L = 10 log 3 x 10⁻⁴ / 10⁻¹²
= 10 log 3 x 10⁸
= 10 ( 8 + log 3 )
= 10 ( 8 + .477 )
= 84.77 dB .
Answer:
Wsep = Wmix
Explanation:
When Cream and milk up in a bottle they might appear homogeneous but after the bottle must have settled down for a while i.e kept in a position without shaking the bottle. the contents ( cream and milk ) will be separated. this is because Milk and cream do not mix up just like some other liquids that don't mix-up. Wmix represents the weight of the bottle before separation while Wsep represents the weight after separation. but since both liquids are in the same bottle the weight after separation would remain the same
Wsep = Wmix
Answer:
serial in which container is filled
Solid -base of container
Liquid- above solid
Gas- above liquid
Explanation:
If any mixture of matter in different state (that solid , liquid or gas )are kept in any container, then substance with higher density will be settled at lowest surface first and similarly the substance with lowest density will be at upper part of container.
In the given container we have to keep solid, liquid and gas
- sold has the highest density,
- gas the lowest density and
- liquid has the density higher than gas but less than solid.
based on this
solid will be at surface of container
above sold will be liquid
above liquid will be presence of Gas
serial in which container is filled
Solid -base of container
Liquid- above solid
Gas- above liquid
Answer:
v=4m/s
Explanation:
The formulas for accelerated motion are:
We can derive the formula 
from them.
We have:
And substitute:
Where in the first step of the last row we just multiplied everything by 2a. Since 
is the displacement d, we have proved that
We use then our values to calculate the final velocity when starting from rest, traveling a distance 0.002m with acceleration 
:
