1. Light that has a frequency of about 5.00 1014 Hz (a wavelength of about 600 n

Question

1. Light that has a frequency of about 5.00 1014 Hz (a wavelength of about 600 nm) appears orange to our eyes. What is the energy in joules of the photons associated with this light?_________ J
2. The human eye is sensitive to orange light having a frequency of about 5.0 1014 Hz (a wavelength of about 608 nm). What is the energy in joules of the photons associated with this light?__________J
3. What are the forces on two charges of +0.41 C and +1.5 C, respectively, if they are separated by a distance of 2.1 m?______N

Do the charges attract or repel each other?

4. An object has eight million more electrons than protons. What is the net charge of the object?_________C
5. How many electrons make up 0.50 coulomb of charge? (Hint: q = ne.)
____________electrons
6. How much longer must the minimum length of a plane mirror be for a 6 ft 6 in man to see his complete head-to-toe image than for a 5 ft 6 in woman to do so?________in
7. Waves moving on a lake have a speed of 2.7 m/s and a distance of 1.5 m between adjacent crests.
(a) What is the frequency of the waves? ____ HZ
(b) Find the period of the wave motion? ______S

Explanation / Answer

Answers for 1 and 2: 1 and 2. Equation: E = hf h = constant = 6.63E-34 f = frequency (same for both 1 and 2) = 5.00E14 E = (6.63E-34)(5.00E14) = 3.3E-19 J

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