A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s
What is the height of the cliff if air resistance is negligibly small?
A) 43 m B) 91 m C) 22 m D) 77 m
B
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A diffraction grating is to be used to find the wavelength of the light in the emission spectrum of a gas
The grating spacing is not known, but a light having a known wavelength of 632.8 nm is deflected by 43.2° away from the central maximum in the second order by this grating. Light of the wavelength to be measured is deflected by 48.2° away from the central maximum in the second order. What is the wavelength of this light?
Which of the following is not true of quasars?
A) Quasars were more common in the past. B) The light produced by quasars comes from an accretion disk surrounding a supermassive black hole. C) Quasars are powered by the intense production of large numbers of stars that can only be sustained for a relatively short time. D) Some quasars can change their brightness on the timescale of hours. E) Some quasars are more than a thousand times more luminous than the Milky Way.
Your image in a plane mirror is
A) virtual. B) real. C) both of these D) neither of these
An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
A. 5.13 B. 5.56 C. 5.72 D. 5.93 E. 4.55