An organ pipe open at both ends has a radius of 4.0 cm and a length of 6.0 m. What is the frequency (in Hz) of the third harmonic? (Assume the velocity of sound is 344 m/s.)
a. 76
b. 86
c. 54
d. 28
e. 129
b
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A hydrogen atom that emits an alpha particle is a routine occurrence in
A) the environment. B) laboratories. C) unlikely. D) impossible.
A surface is coated with a material having index of refraction 1.41 . If light in air has a wavelength of 701 nm and is normally incident on this surface, and it is found through interference effects with this light that the surface is 11 wavelengths thick, which of the following is the thickness of the surface?
a. 4.5E–8 m b. 5.5E–6 m c. 2.7E–6 m d. 1.4E–6 m e. 2.1E–5 m
A 250 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 2.5 N/cm (Fig. 7-30 ). The block becomes attached to the spring and compresses the spring 12 cm before momentarily stopping. While the spring is being compressed, what work is done on the block by
(a) the gravitational force on it and
(b) the spring force?
(c) What is the speed of the block just before it hits the spring? (Assume that friction is negligible.)
(d) If the speed at impact is doubled, what is the maximum compression of the spring?
What is mass diffusivity?
What will be an ideal response?