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Light of wavelength 650 nm is incident normally from above upon a glass plate. The glass plate rests on top of a second plate so that they touch at one end and are separated by 0.0325 mm at the other end as shown in the figure.
What is the horizontal separation between adjacent bright fringes, when viewed from above? ...MORE
Subject: Physics | Topic: Optics | ID: 155354
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Two loudspeakers are 2.63 m apart. I am standing 1.56 m from one of them and 3.58 m from the other.
The two speakers are driven by a single oscillator.
If the frequency of the oscillator is swept from 100 Hz to 1000 Hz, find the lowest frequency (Hz) at which I will hear an enhancement of the sound intensity due to constructive interference of the waves from the two speakers.
Use 343 m/s for the speed of sound.
(DO NOT use the double-slit equation, d sin θ = mλ. This equation is only valid for observations far from the two slits, compared to the distance between the two slits.) ...MORE
Subject: Physics | Topic: Optics | ID: 155590
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The diameter of a laser beam is due entirely to the diameter of the hole through which it passes as it exits the instrument. However, at large distances, the diameter of the beam increases due to diffraction at that hole.
Suppose that for a particular laser, the diameter of the beam is 1.1 cm at a distance of 22.5 m.
The wavelength of the laser light is 633 nm.
Find the diameter (mm) of the hole through which the beam exits the instrument.
Caution: the value of θ min is measured from the center of the diffraction pattern to the first dark ring.
Give the answer to 2 significant figures. ...MORE
Subject: Physics | Topic: Optics | ID: 155593
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A hobby telescope uses a concave mirror with a diameter of 17 cm.
Find the distance (km) between two points on the moon that can be resolved by this telescope.
Use 550 nm for the wavelength of visible light.
Give the answer to 2 significant figures.
...MORE
Subject: Physics | Topic: Optics | ID: 155594
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A diffraction grating contains 15,000 lines/inch.
We pass a laser beam through the grating. The wavelength of the laser is 633 nm. On a screen 2.67 m away, we observe spots of light.
(a) How far (m) from the central maximum (m = 0) is the first-order maximum (m = 1) observed?
(b) How far (m) from the central maximum (m = 0) is the second-order maximum (m = 2) observed?
DO NOT calculate this using the “small-angle approximation,” y bright =(λL/d)m.
The angles are too large for sin θ ≈ tan θ to be a good approximation. ...MORE
Subject: Physics | Topic: Optics | ID: 155596
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