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