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I have a total of 6 questions, 3 of them are posted here and 3 of them are provided in the link because they involve graphs.

1. KE of an electron is twice that of a proton, what is ratio of de broglie wavelength of proton:electron?

__My answer: since de broglie wavelength is lamba = h/mu. I put in all the values and mass of electron and proton. In the end, I get the answer as 0.00109. But I wish someone can help me double check to see if my answer is correct.__

2. If given work function of a metal, eg 2 Joules. And given wavelength of a photon to be eg, 5 meter. how to find stopping voltage? In another word, if given wavelength (in meter) and work function (in Joules), how to find stopping voltage (in Volt)?

__My answer: I am unsure of this question because I am unsure about the relationship between wavelength, stopping voltage and work function. Is it c/hλ + work function = stopping voltage?__

3. A spherical molecule has mass "M" kg and diameter of "D"nm. The uncertainty in position is equal to the diameter. What is the minimum speed of the molecule?

__My answer: This question I don't really know. I think it involves heinsberge uncertainty principle. Anyone can enlighten me?__

4. http://i42.tinypic.com/2pzmq38.png

__My answer: My educated guess is option B because since both source one and two have same wavelength, starting applied voltage should be same. But I do not understand why graph of source II is higher than graph of source I. Please tell me if my answer is correct or wrong and explain your answer in detail.__

5. http://i44.tinypic.com/214pi61.png

__My answer: My guess is option 4. It is related to question 4. If someone can explain question 4, i think i can do this question. Please tell me if I am wrong or correct, and why.__

6. http://i42.tinypic.com/ka4j8k.png

__My answer: This question i really have no idea. Someone please help me ):__

For all questions, please provide an answer and tell me why you think it is the answer. Explanation is key.

Thank you for your time!