18.  (a) Calculate the momentum of a visible photon that has a wavelength of 500 nm. (b) Find the velocity of an electron having the same momentum. (c) What is the energy of the electron, and how does it compare with the energy of the photon?

19.  What is the distance between the slits of a grating that produces a first-order maximum for the second Balmer line at an angle of 15º?

A 30 year old patient is given a dose of the radiopharmaceutical technetium-99m for a diagnostic scan. The radioisotope follows first order kinetics and has a half life of 6 hours. A dose of 800 microcuries is administered intravenously.   How many microcuries of technetium-99m will decay in the first 18 hours?    

A 40-year-old patient is diagnosed with diabetes. He is lean, physically active, and has no family history of type 2 diabetes. He was initially treated with metformin but has rapidly worsening glycemic control. Which diagnostic test would be most useful to clarify the underlying diagnosis?

A 36-year-old patient is currently prescribed lithium citrate (Priadel) 520mg/5ml liquid at a dose of 15mL AT NIGHT. To improve compliance, the decision is made to switch him to lithium carbonate (Priadel) 200mg MR tablets. Extract from Online BNF   How many Priadel 200mg MR tablets should the patient be prescribed for each dose?

A 65‑year‑old patient (weighing 75 kg) is prescribed rituximab intravenous infusion for the treatment of non‑Hodgkin lymphoma. The prescribed dose is 375mg/m2, and the patient’s body surface area is calculated to be 1.8m2. The dose is diluted to a final volume of 500mL and the infusion protocol is as follows: Start at 50mg/hour for the first 30 minutes If tolerated, increase to 200mg/hour for the remainder of the infusion   How many minutes will it take to administer the full dose?

A 60-year-old male patient is prescribed IV gentamicin once daily for a severe infection. To optimise dosing, an adjusted body weight (AdjBW) should be used. The patient weighs 95kg and has a height of 5 feet 10 inches. The following equations are provided: Ideal body weight (IBW) Men: IBW (kg) = 50 + 2.3kg for each inch over 5 feet Women: IBW (kg) = 45.5 + 2.3kg for each inch over 5 feet Adjusted body weight (AdjBW)AdjBW (kg) = IBW + 0.3 × (actual body weight − IBW)   Gentamicin should be dosed at 5mg/kg once daily, using AdjBW. Doses should be rounded to the nearest 20mg.   What is the recommended daily dose of gentamycin in milligrams for this patient?

A patient develops diffuse muscle pain two months after starting atorvastatin. Which laboratory test should be obtained?

Consider the following code snippet. What is the wrong options that can not be used as MyType? public static MyType GetMax3 (MyType i, MyType j, MyType k) { // determines max};

Which of the following abbreviations is a test that determines the number of antibodies against cell nuclei present in the bloodstream?