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An element x with atomic number 29 has two isotopes Y and Z have 34 and 38 neutrons respectively. Calculate the
a.mass number of each isotope, and hence, write their nuclear symbols.
b.percentage abundance of each isotope, if the relative atomic mass of element x is 63.5.
An object is 3 inches in front of a concave mirror with radius of curvature 12 inches.
Find: a) the image distance.
b) the magnification.
c) the image description: real of virtual? erect of inverted?
`Batrachotoxin (C31H42N2O6) is the most potent non-peptide (we'll learn what that means in Lesson 7) based poison known. It gained fame though its use in poison darts made from frog excretions. The frogs themselves don't produce the toxin directly, but through digestion of Melyrid beetles the frogs eat. Suppose you are trekking through the rainforest and discover an even more potent toxin that has the same empirical formula as batrachotoxin. If the molar mass of this new poison is 3,232.02 g/mol, what is its molecular formula?
An object is 3cm in front of a convex lens with 2cm focal length.
Find: a) the image distance
B)the magnification.
C)the image description: real or virtual? erect or inverted?
A flashlight underwater (n=1.43) is aimed at the surface with incident angle 30°. What is the angle of refraction in the air (n=1) ?
Find the quantum ( photon) energy associated with a 650.kHz AM radio signal.
A car, with it's horn producing 480.Hz, is traveling 40.0mi/h away from you (standing still). What frequency do you hear, given the speed of sound is 1090.ft/s ?
If a 20dB sound level (ticking clock) is replaced by 80dB (garbage disposal), by what factor has the sound intensity been multiplied?
A catapult consists of a rubber of unstretched length, 0.20m. The rubber is stretched by 0.10m by a tension of 50N. A stone of mass 0.06Kg is projected vertically upwards from the catapult after the rubber has been stretched to a total length of 0.35m. Calculate the energy stored in the stretched catapult and determine the maximum height reached by the stone.
4.5m of air a gauge pressure 46.kPa undergoes an isothermal expansion to where the gauge pressure drops to 13.kPa. Calculate the final volume in m3
#339914 on Dec 2023