How can I solve these two challenging AS physics questions?

In summary, Mea is struggling with two physics questions and is seeking help. The first question involves finding the number of visible photons produced per second from a 2Watt lamp with a range of wavelengths near 5x10^-7m. Mea's initial attempt using E=hf resulted in an incorrect answer. The second question involves finding the time of travel and number of rotations of a photon with a frequency of 6x10^14Hz traveling a path of 6m. Mea is asking for a different approach to solving the first question.
  • #1
meawinner
11
0
Here are two questions I am stuck on:
1. How many visible photons are produced per second from a 2Watt lamp? It says the range of the wavelengths is near 5x10^-7m. I tried this and got 3.33x10^33Hz but apparently that's wrong so please help me.

2. A photon of frequency 6x10^14Hz explores a path 6m long. Find the time of travel and the number of rotations of the phasor. This one I don't have a clu how to start but if I get the first answer I can easily work out the number of rotations of the phasor.

Please help me as I am really stuck...physics is really hard on this AS course. Thanks for all your help

meawinner
 
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  • #2
Mea, do you know the energy of each photon is given by Planck's constant times the frequency?

2 Watts is power = energy per second.
 
  • #3
Yup

Yeah i tried this and that's where i got the 3.33blah blah blah... answer. I used 2W = 2joules per second and therefore if its one second it 2 joules, i put this in E=hf and it came out wrong as that's not the answer in my textbook. Dont say why can't i just copy it because the teacher will know if there is no working. But thanks anyway. Do you know any other way?
 
  • #4


Originally posted by meawinner
... Do you know any other way?
Try again. First find the energy of a single photon, using E =hf. (Hint: First change the given wavelength into frequency, using the wave equation: v = fλ.)
 

FAQ: How can I solve these two challenging AS physics questions?

Why is AS physics considered hard?

AS physics is considered hard because it requires a strong foundation in mathematical and scientific concepts, as well as critical thinking and problem-solving skills. The subject matter can also be complex and abstract, making it challenging for some students.

How can I improve my understanding of AS physics?

To improve your understanding of AS physics, it is important to practice regularly and review your notes and textbooks. You can also seek help from your teacher or join a study group to discuss difficult concepts and problems.

What are the most important topics in AS physics?

The most important topics in AS physics include mechanics, electricity and magnetism, waves and optics, thermal physics, and atomic and nuclear physics. These topics form the foundation for more advanced physics concepts in higher levels of education.

What are common mistakes students make in AS physics?

Common mistakes students make in AS physics include not fully understanding the fundamental concepts, not showing all the steps in problem solving, and not practicing enough. It is important to have a solid understanding of the basics and to show all the steps in problem solving to avoid making mistakes.

How can I prepare for AS physics exams?

To prepare for AS physics exams, it is important to start studying early and make a study schedule. Practice past exam papers and familiarize yourself with the format of the exam. Also, make sure to review all the important topics and seek help from your teacher if needed.

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