A voltaic cell consists of Cu²⁺/Cu and Cd²⁺/Cd half-cells. Each compartment has a volume of 0.500 L with the following initial concentrations: [Cu²⁺] = 1.250 M; [Cd²⁺] = 0.250 M at 25°C. What is the [Cu²⁺] when the voltage has dropped to 0.719 V? (E⁰ for Cu²⁺/Cu = 0.340 V and E⁰ for Cd²⁺/Cd = -0.400 V.)

a bullet of mass m and speed v is fired at an initially stationary sphere. The bullet goes through the sphere, and exits with a speed of v/3. The sphere is attached to a rigid pole of length L and negligible mass. What is the minimum value of v such that the sphere will barely swing through a complete vertical circle? (Use the following as necessary: m, L, g, and M for the mass of the sphere.)

2) a). The resistivity of a wire varies with its

1. length
2. area of cross-section
3. mass
4. material

b) Given the units of a physical quantity. Choose the correct relation (J is for Joule, V is for volt, C is for Coulomb)

A) J = CV

B) J = VA

C) J = C/A

D) V = J C

c) A charge of 3 C moving in a uniform electric field experiences a force 3000 N. The potential difference between two points situated in the field at a distance 1 cm from each other will be

A) 10 V

B) 90 V

C) 1000 V

D) 9000 V

d) Choose the only incorrect relation:

A) ampere = coulomb/second

B) volt = coulomb/joule

C) ohm = volt/ampere

D) coulomb = Joule/volt

e) In an astronomical telescope, the image formed by the objective is I₀   and that formed by eye piece is I_e . Then

A) I₀   and I_e are both real

B) I₀   and I_e are both virtual

C) I₀   is virtual and I_e   is real

D) I₀   is real and I_e   is virtual

Describe the Blackbody radiation experiment; what did this experiment involve? What problem was encountered (what did classical physics predict versus what was observed)? What was learned or reinterpreted as a result of explaining the experimental results?

Be concise, each part should not take more than 3-4 sentences.

An experiment procedure starts with 625.0 mL of a 9.10 M hydrocyanic acid (HCN(aq)) solution. During the course of the experiment, the volume of the this acid solution is increased by 1.457 L by the addition of water solvent as part of the outcome. Based on this information, what would be the altered molar concentration of the aqueous HCN solution?

In preparing protein sample for crystal structure : (a) Why is it necessary to use large amount of crystallisation solutions for the vapour diffusion experiment ? (b) Give reason why sitting drop format may be used for the experiment .(c) Explain why it will not be necessary to make selenium derivatives of enzyme used for the crystal trials .

In an experiment testing a herbal extract of echinacea versus vitamin C against the common cold 60 college students in good health are randomly selected to participate. Design an experiment. Include a control group. Carry out the randomization beginning at Row 04 Column 06 in Table 1 random digits.

Design and briefly describe an experiment you could conduct to determine whether infants can tell the difference between the shapes of different letters in the alphabet. How is the experiment structured, how will you use the results to decide what you have discovered, and are there any ethical considerations you must deal with?