What is the wavelength of a radio wave emitted at 88.0 mhz

The speed of all electromagnetic waves in empty space is 3.00 x 108 m/s. Calculate the wavelengths of electromagnetic waves emitted at the following frequencies: Radio waves at 88.0 MHz (3.41 m) Visible light at 6.0x108 MHz (5.0 x 10-7 m)

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out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance