1. Which of the following is NOT true about EM waves? a.They need a medium to pr

ID: 1454000 • Letter: 1

Question

1. Which of the following is NOT true about EM waves?

a.They need a medium to propagate

b.They all have the same speed in vacuum

c.They are transverse waves

d.Higher frequency waves have shorter wavelengths

2.Consider the EM wave shown below. The direction of propagation is along x-axis, as shown. Which of the following statements is true:

a.The electric field at any point on a plane parallel to the y-z plane is the same

b.The magnetic field at any point on a plane parallel to the y-z plane is the same

c.There are planes parallel to the y-z plane where electric and magnetic fields are both 0

d. All of the above

3. As you go from left to right in the EM spectrum:

a. wavelength decreases

b. frequency increases

c. energy increases

d. all of the above

4. If light takes 8 minutes and 20 seconds to travel from sun to earth, what is the distance travelled?

5. Green light has a wavelength of 550 nm in vacuum. What is its frequency? What is its time period?

Q1) the statement (a) is FALSE as EM waves donot require any medium to propagate.

Q2) c

Q3) all of the above

Q4) d = v*t = 3*108 * 500 = 1.5E11m

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