Which switches must be closed to illuminate light bulb A? Which switches must be

Question

Which switches must be closed to illuminate light bulb A? Which switches must be closed to illuminate both light bulb A and light bulb B at the same time? Switches 1 and 2 for A switches 1, 2 and 3 for both switches 1 and 2 for A switch 4 for both switches 1, 2 and 4 for A switches 1, 2 and 3 for both switches 1, 2 and 4 for A switches 1, 2, 3, and 4 for both The figure to the right is a graph of voltage versus time. What is the frequency of the displayed signal? 0.080 Hz 6.25 Hz 12.5 Hz 40 Hz 80 kHz The speed of sound in air is 340 m/s. What is the wavelength in air of a 272 Hz sound wave? 0.80 m 1.25 m 68.0 m 272 m 340 m Two narrow slits separated by 0.090 mm are illuminated by a laser and produce a diffraction pattern on a screen 3.0 m away as shown in the figure. If the fourth intensity maximum is 8.4 cm away from the center of the central bright spot, what is the wavelength of the laser light? 410 nm 150 nm 520nm 630 nm 700 nm 740 nm

Explanation / Answer

(5)
To illuminate Bulb current should pass through it.

To illuminate only Bulb A,
Switches 1 , 2 & 4 must be closed.

To illuminate Both the Bulbs,
All the switched must be closed.

Correct Option - (d)

(6)
We know,
f = 1/T
From graph Time period, T = 80 ms
f = 1/(80*10^-3)
f = 12.5 Hz

Correct option - (c)

(7)

We know,
Velocity = Freq * Wavelength
Wavelength = Velocity/Freq
Wavelength = 340/272
Wavelength = 1.25 m

please post seperate questions in seperate post only.

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