Answer:
The net charge on the shell is 30x10^-9C
Explanation:
Pls see attached file
Answer:
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The density of an object is given by:
D = M/V
D = density, M = mass, V = volume
The volume of the cube V is given by:
V = s³
where s = side length
Make a substitution:
D = M/s³
Given values:
M = 20kg, s = 20×10⁻²m
Plug in and solve for D:
D = 20/(20×10⁻²)³
D = 2500kg/m³
The correct answer is
<span>B) UV waves are higher frequency and carry more energy.
In fact, UV waves have higher frequency than visible light. For comparison, visible light has frequency in the range 430-770 THz (</span>

)<span>, while ultraviolets (UV) have frequency higher than these values (at the order of 1 PHz, </span>

).
The energy of electromagnetic radiation is proportional to its frequency, according to the equation

where h is the Planck constant and f is the frequency. We see that the higher the frequency, the greater the energy, so UV waves carry more energy than visible light.
Answer:
10 second time is required
Explanation:
Formula for power is
P = W/t
Solve for time
t = W/P =2500/250
t = 10 sec
Mark brainliest if you understand