Which of the following is correct?

gas atoms subjected to electricity emit bright lines of light.

gas atoms absorb white light and emit a continuous spectrum of light.

gas atoms under high pressure emit dark lines against a continuous spectrum.

gas atoms heated to a high temperature emit white light.

 Gas atoms subjected to electricity emit bright lines of light.

Explanation:  When Gas atoms are subjected to electricity, they will shake the electrons present in the atoms which would be in random motion in the atom itself.

Thus it will eject one one electron which will move into another higher energy levels releasing photons.

Thus they will emit bright lines of light.

Gas atoms do absorb white light but they donot emit a continuous spectrum of light.

law of conservation of matter

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j