# Midterm 2 Solutions - Piazza

## Midterm 2 Solutions - Piazza

Assessment https://cms.psu.edu/Section/Assessment/Delivery/AssessmentAl... 1. The energy of a photon depends on A) Width B) Direction C) Velocity D...

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Assessment

https://cms.psu.edu/Section/Assessment/Delivery/AssessmentAl...

1.

The energy of a photon depends on A) Width B) Direction C) Velocity D) Color

The organization that studies climate change is A) IPCC B) IAEA C) NAACP D) AFL-CIO

In the photoelectric lab that you did, changing the intensity of the light led to A) A change in the stopping potential B) More photons to hit the target C) None of the other choices D) A change in the color of the light

Which one of the following is considered unethical in the physicist code of conduct? A) Fabrication of data B) All the other choices C) Plagiarism D) Falsification of Data

An electron is placed in a constant electric field to the left. In which direction is the force on the electron?

A) Bottom B) Up C) The electron feels no force. D) Right E) Left Correct answer(s): D 6.

AC won out over DC in the war of currents in part because of this critical device: A) The electric generator B) The battery C) The Tesla coil D) The electric motor E) The transformer

I hold a light detector in my hand that can detect individual photons. If I want to increase the likelihood of detecting a photon, I want to A) Move to where the electromagnetic wave is more intense B) Make faster measurements. C) Move to where the electric field is zero. D) none of the other choices

Solar cells produce electricity from sunlight using which of the following physical effect? A) Band Effect B) Doppler effect C) Photoelectric effect. D) Meisner effect

The color of an oil slick indicate that A) Oil is made of many different chemicals with different colors B) Light changes its wavelength when passing through oil C) Light bends when entering a material D) Light is a wave and it can have interference

Correct answer(s): D 10. A rotating coil of wire inside of a magnetic field could be A) an electromagnet

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Assessment

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B) an electric generator of AC current C) a transformer D) an electric generator of DC current Correct answer(s): B 11.

What is the difference between the two batteries depicted below using the water-tower analogy?

A) Different current output B) Different energy stored C) Different voltage D) Different charge Correct answer(s): C 12.

A typical frequency of infrared radiation by your body is 1.2 x1013 Hz. What is the energy per photon of such radiation? I remind you that Planck's constant is h= 6.6 x10-34 J s A) 1.66 x 10-38 J B) 3 x 108 J C) 7.95 x 10-21 J D) 2.5x10-5 J

Correct answer(s): C 13. A volt is a measure of A) Density of electrons B) Force on the electron C) Energy per electron D) Number of electrons per second Correct answer(s): C 14. Which of the following device contains an electrolyte where positive ions are moving? A) Capacitor B) Battery C) Insulator D) Conductor Correct answer(s): B 15. When light made of a single wavelength is shone on a piece of metal, no electrons are seen to be ejected. In order to eject electrons one should: A) Decrease the intensity of the light B) Increase the wavelength of the light C) Decrease the wavelength of the light D) Increase the speed of the light Correct answer(s): C 16. Faraday discovered that one could generate electricity with a coil of wire and a magnet by: A) none of the other choices B) Having the magnet sit inside the coil of wire C) Moving the coil of wire towards the magnet D) just having a really strong magnet anywhere close to the coil of wire (but not moving). Correct answer(s): C

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Assessment

https://cms.psu.edu/Section/Assessment/Delivery/AssessmentAl...

17. Is it good (right? ethical? necessary?) to exaggerate a technical/scientific issue in order to get the public concerned? What are the dangers of doing that? What are the dangers of not doing that?

Many possible answers. Was looking for an argument that was making sense.

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Correct answer(s): 18. A politician proposes that to reduce our use of fossil fuels, we should replace all natural gas & oil heat systems in homes with electric heat. As an informed citizen who took Phys 10, what problems do you see with this proposal?

The problem with this proposal is that almost all electricity is generated by burning fossil fuels like gas, coal or oil. So this politician is making no sense, changing to electric heat will not reduce our consumption of fossil fuels in any way.

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Correct answer(s): 19. Name one aspect of the photoelectric experiment that can only be explained if light is a particle.

-- the fact that there is a threshold of frequency -- the fact that the intensity does not affect the speed of individual electrons. If light was a wave, frequency should not matter and more intense light should lead to higher energy electrons HTML Editor

Correct answer(s): 20. Infrared radiation is also called IR. Describe how it is different from visible light. What emits IR?

it differs about wavelength objects at room temperature radiate primarily in infrared range.

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