Me with these questions as soon as possible i need to turn it
a 60 watt light bulb uses 60 joules of electrical energy every second. however, only 6 joules of electrical energy is converted into light energy each second.
a. what is the efficiency of the light bulb? give your answer as a percentage.
b. what do you think happens to the “lost” energy?
19. the work output is 300 joules for a machine that is 50% efficient. what is the work input?
20. a machine is 75% efficient. if 200 joules of work are put into the machine, how much work output does it produce?

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?