Answer:
Because there is nothing out in space , the sound waves from one astronaut's whistling can't travel over to the other astronaut's ears.
Answer:
Explanation:
Given
Radius of A is twice of B i.e.

Also Potential of both sphere is same


thus




(b)Ratio of 
Electric Field is given by 
thus
----1
----2
Divide 2 by 1


Answer:
That the Sun was the center of the universe.
Explanation:
Ptolemy believed in geocentrism, which means that the Earth is the center of the Universe. This was also supported by Aristotle. Copernicus on the other hand believed in a heliocentric system, which proposes that the sun is the center of the universe.
Answer:
The distance from harvest mouse to the leaf is 4.74 m.
Explanation:
Given that,
Intensity = -10 dB
Distance = 1.5 m
We need to calculate the power of intensity
Using formula of power of intensity


Put the value into the formula


We need to calculate the minimum intensity level
Using formula of minimum intensity





We need to calculate the area
Using formula of intensity


Put the value into the formula


We need to calculate the distance
Using formula of area

Put the value into the formula




Hence, The distance from harvest mouse to the leaf is 4.74 m.