Physics
Which electromagnetic radiation is used for satellite communication ?

Radiowave
Millimeter wave
Infrared
Ultraviolet

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Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
the same number of protons but different number of neutrons
equal number of nucleons
equal number of protons and electrons

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus changes whereas its atomic number does not change
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus does not change whereas its atomic number changes
Neither the mass number nor the atomic number of the nucleus changes

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

Their velocity increases and they fall with same velocity on the earth
Their velocity increases and they fall with different velocity on the earth
They fall with same ultimate velocity
They fall with that ultimate velocity, which are different for different droplets

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