Answer:
The light of a light bulb contains all the wavelengths of visible band which on passing through diffraction grating appear in the form of continuous spectra.
Discrete lines are observed when the electron makes a transition from higher orbit to lower orbit releasing a photon having energy which is equivalent to the energy difference between the two orbits.
Answer:
2500 J
Explanation:
We can solve the problem by using the first law of thermodynamics:

where
Uf is the final internal energy of the system
Ui is the initial internal energy
Q is the heat added to the system
W is the work done by the system
In this problem, we have:
Q = +1000 J (heat that enters the system)
W = +500 J (work done by the system)
Ui = 2000 J (initial internal energy)
Using these numbers, we can re-arrange the equation to calculate the final internal energy:

Answer:E. an object will remain in uniform motion unless acted upon by a force
Explanation:
Weight is the force exerted on an object by gravity. So, weight of any object on the moon is 1/6 that on Earth.