Answer:
Thomson used a beam of negatively charged particles. Explanation: It was on a test i got it right.
Answer:
-67 m/s
Explanation:
We are given that
Mass of ball,m=0.4 kg
Initial speed,u=14 m/s
Impulse,I=-32.4 N-s
Time,t=27 ms=
We have to find the mass's velocity in the x- direction.
We know that

Substitute the values




Answer:
Wien peak ( λmax ) is 107.40 nm
radius of super giant is 1.086 ×
m
Explanation:
given data
temperature 27 kK
power = 100000 times of Sun
Sun radius = 6.96 × 10^8 m
to find out
Wien peak ( λmax ) and radius of supergiant (r)
solution
we will apply here first wien law to find Wien peak that is
λmax = b / t
λmax = 2.9 ×
/ 27000 = 1.0740 ×
so Wien peak ( λmax ) is 107.40 nm
and
now we apply steafay law that is
P = σ × A ×
.........................1
and we know total power output 100000 time of Sun
so we say
4πr²s
= 100000 × 4πR²s
r² = 100000 × R²
/ 
put here value
r² = 100000 × (6.96×
)² ×
/ 
r² = 1.18132 ×
r = 1.086 ×
m
so radius of super giant is 1.086 ×
m
26. D. crushing the sugar cube and dissolving it in water.
27. A. atom
28. B. molecule
29. B. plum pudding model of Joseph John Thomson
30. B. He used cathode ray tubes which showed that all atoms contain tiny negatively charged subatomic particles or electrons
31. D. protons and neutrons are relatively heavier than electrons.