Among the following electromagnetic waves, photons of which electromagnetic radiations carry the highest energy?
A) X-rays
B) Visible light
C) Radio waves
D) Gamma rays
D
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A steel bar of rectangular cross section (a 5 38 mm, b 5 50 mm) carries a tensile load P. The allowable stresses in tension and shear are 100 MPa and 48 MPa, respectively. The maximum permissible load Pmax is approximately:
(A) 56 kN
(B) 62 kN
(C) 74 kN
(D) 91 kN
Sound waves in the early universe traveled faster than half of the speed of light
Indicate whether the statement is true or false
In the production of sediment from fresh rock, which usually occurs first, erosion or weathering?
What will be an ideal response?
A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and this is its entire energy output during this time. How energy-efficient is this bulb [as a producer of light]?
A) 400% B) 20% C) 25% D) 500% E) 80%