Find the frequency of X-rays of wavelength 1 Å = 10?10 m
a. 3 × 10^18 Hz
b. 3 × 10^10 MHz
c. 6 × 10^9 Hz
d. 3 × 10^8 Hz
e. 3 × 10^20 Hz
a
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A. is always the same for all objects B. depends on the velocity at which an object moves C. depends on the mass of an object D. depends on the acceleration at which an object moves
A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity
What is the direction of the electric field? A) along the -y-axis B) along the +y-axis C) along the -x-axis D) along the +x-axis E) along the -z-axis
You have discovered a star system consisting of three equally spaced stars of equal mass arranged in a straight line. The two outermost stars, Zenith and Nadir, revolve synchronously around the central star, Janus
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The earliest evidence for life on Earth dates to
A) about 4.5 billion years ago. B) about 3.8 billion years ago. C) about 2 billion years ago. D) about 570 million years ago. E) about 65 million years ago.