Need help on a few Physics problems!! 17. The SI unit for motional emf is? 18. A
ID: 1484279 • Letter: N
Question
Need help on a few Physics problems!!
17. The SI unit for motional emf is?
18. An infinite wire carries a 25.0-A current directed in the positive y direction. Determine the magnetic field at the point x = 3.00 cm on the x-axis.
19. What is the wave number according to the following wave equation? (distances in m, time in s)
y = 0.5 sin(2.0x-0.33t)
20. What is the speed of sound in air?
21. Orangle light has a lower energy than green light. (True or False)?
22. The higher the energy of light, the faster light travels. (True or False)?
23. Light reflects at all boundaries. (True or False)?
24. What is the frequency in SI units of the wave described by
y = 4.2 sin(1.7x - 2t) where distances are in m, time in s?
25. Calculate the distance from the central fringe to the first bright fringe for a wavelength of 630 nm, if the distance between the double slits is 0.10 cm and the distance to the screen is 1.0 m.
26. Constructive interference occurs when two waves add when one wave is at a crest and the other at a troph.
(True or False)?
Explanation / Answer
17) SI unit for motional emf is Volt (V)
18)
19) k=2pi/L=2
Then wave number=1/L=0.32 m-1
20) speed of sound in air =343 m/s
21) True
22) True
23) False
24) f =1 Hz
25)
26) False
23)
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