In a double slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 100 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point 5 mm from the central maximum when the wavelength is 400 nm? (Convert your result so the angle is between 0 and 360°.)
a. 90°
b. 180°
c. 270°
d. 360°
e. 160°
B
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Is the specified change in the following objects’ thermal energies due to a flow of heat (A), work (B), or some other flow of energy (E)?
(a) A hot cup of tea on a table becomes cooler with time. (b) A meteorite entering the atmosphere becomes hot. (c) Liquid nitrogen poured on a slab of ice boils furiously. (Liquid nitrogen’s boiling point is 77 K.) (d) Infrared laser light falling on a metal slab makes it hot. (e) A drill bit gets hot as it drills a hole in a metal slab.
You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1340 Hz
You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1300 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s. A) 38.4 m/s B) 30 m/s C) 39.2 m/s D) 40.1 m/s E) 41.7 m/s
An object 2.0 cm tall is placed 24 cm in front of a convex mirror having a focal length of magnitude 30 cm
(a) Where is the image formed and how far is it from the mirror? (b) How tall is the image?
A 60.0 cm long organ pipe is filled with air and is open at both ends. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the fundamental mode?
A. 115 cm B. 120 cm C. 131 cm D. 142 cm E. 167 cm