As speed decreases, if we change medium of electromagnetic waves from air to water, frequency

also decreases.

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also increases.

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remains same.

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may increase or decrease.

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Solution

The correct option is C remains same.
As speed decreases, if change medium of electromagnetic wave from air to water, frequency remains same.
As we go from one medium to another the frequency stays same, but the wavelength changes. Change in speed is proportional to change in wavelength.

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As speed decreases, if we change medium of electromagnetic waves from air to water, frequency

The correct option is C remains same.As speed decreases, if change medium of electromagnetic wave from air to water, frequency remains same.As we go from one medium to another the frequency stays same, but the wavelength changes. Change in speed is proportional to change in wavelength.

The correct option is C remains same.
As speed decreases, if change medium of electromagnetic wave from air to water, frequency remains same.
As we go from one medium to another the frequency stays same, but the wavelength changes. Change in speed is proportional to change in wavelength.