1) Two sinusoidal waves travel in the same direction and have the same frequency

Question

1) Two sinusoidal waves travel in the same direction and have the same frequency. Their amplitudes are A1 and A2. The smallest possible amplitude of the resultant wave is

Choose one:

A. A1 + A2 and occurs when they are 180o out of phase

B. A1 + A2 and occurs when they are in phase

C. |A1 - A2| and occurs when they are in phase

D. |A1 - A2| and occurs when they are 90o out of phase

E. |A1 - A2| and occurs when they are 180o out of phase

2)Light from a helium-neon laser (? = 633 nm) passes through a narrow slit and is seen on a screen 2.2 m away from the slit. The first minimum in the diffraction pattern is 3.6 cm from the central maximum. How wide is the slit?

3)A monochromatic light source illuminates a double slit and the resulting interference pattern is observed on a distant screen. The slit spacing is 4 mm, the slit width is 0.1 mm, the screen is 0.75 m from the slits, and the dark lines on the screen are separated by 6 mm. What is the wavelength of the light?

Explanation / Answer

When ever these kind of question are being asked just only concentrate on the angle in the standard formula for finding resultant amplitudes. You will get resultant max when angle in between is 180 and for min. 90

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