# Recent content by amit25

1. ### Specific Rotation Problem

Thanks, hmmm..im not sure if we're expected to make some assumptions but that's how the Question was worded exactly.
2. ### Specific Rotation Problem

Homework Statement The specific rotation of a tetrasaccharide was measured to be -20.5°. Upon complete hydrolysis in acid the optical rotation of the solution was found to be -36.9°. Knowing that the specific rotations of n-acetylgalacosamine,3-deoxy-l-fucose and 2-deoxy-D-ribose are...
3. ### Ionic exchange

Homework Statement 10 mL solution of 0.5 M CrCl(OH2)52+ is allowed to aquate to Cr(OH2)63+. To determine an approximate rate of reaction, the amounts of CrCl(OH2)52+ and Cr(OH2)63+ present after a certain period of time are evaluated. This is done by pouring the solution on a cation exchange...
4. ### Calculate molar conductivity of Co(NH3)4CO3]NO3?

Homework Statement This was determined from an experiment,where the resistance of 0.02M of KCl was to be determined [KCl]=0.02M conductance=2.86ms L=0.002768ohm^-1 to obtain k Co(NH3)4CO3]NO3 : conductance: 1.923ms concentration of cobalt complex: 0.002M Homework Equations k=RL...
5. ### Helium atom and bohr model

should i use this ΔE = RchZ²{1/n²(1) - 1/n²(2)} where R is the Rydberg constant (1.0974 x 10E7 m-¹); c the speed of light in vacuum (2.9979 x 10E8 m s-¹); h Planck's constant (6.626 x 10E-34 J s); Z nuclear charge; n(1) & n(2) are the principal quantum numbers of the electron transition
6. ### Helium atom and bohr model

Homework Statement He+ ion consists of a nucleus which is an alpha particle plus one orbiting electron.Hence it has a net positive charge. a)Derive an expression for the electron state energies b)what is the wavelength associated with a transition between the lowest two energy states...
7. ### Constructive Interference of Sound waves

i think r is suppose to represent distance. The question gives me the formula in terms of r I guess my question is if my calculations are correct? Not sure if im on the right track. Im not sure how many answers to give I wasnt told but I calculated up to 3.
8. ### Constructive Interference of Sound waves

Homework Statement A pair of speakers connected to the same signal generator face each other, one at x=0 and the other at x=1.5m. If they are producing a sound frequency of 2000Hz what are the points (position x) of constructive interference between the speakers? Express your answer in...
9. ### Magnetic field of earth, how much current needed to cancel it

Homework Statement Solenoid consists of a hollow tube of length 5 meters and around which 1000 turns of wire are wrapped.? Current I flowing in the wire generates a magnetic field whose direction is given by the right hand rule. It can be shown the magnetic field in a long narrow tube is...
10. ### Doppler effect

Homework Statement Man travels down the highway in his car whistling middle C A policeman has a defective radar gun but passed a physics course. He hears the pitch change from D(294 Hz) immediately above middle C(262Hz) to A#(233Hz) immediately below middle C as the car passes. a) How fast...
11. ### Waves of sound from singer

lol well i have a sheet we got with all the notes and frequency so i dont think were expected to memorize them, anyways thanks i feel like this is going no where ill just ask my professor
12. ### Waves of sound from singer

from here not sure which octave anyways i think its wrong the answer should still be C http://www.sengpielaudio.com/calculator-… [Broken] Scroll down to "Frequency to Musical Note Converter".
13. ### Waves of sound from singer

so 2.7 x 262hz=707hz so thats F5 note ?
14. ### Waves of sound from singer

those are the same values i just researched to get more accurate values
15. ### Waves of sound from singer

927 is the speed of helium and 343 is the speed of sound