אם את שומעת קול מוזר, תבדקי אם יש בעיה.

Hebrew uses אם for both:

• if in a condition: אם את שומעת... = if you hear / if you are hearing...
• whether/if in an embedded clause: אם יש בעיה = whether there is a problem

So the two אם words have slightly different jobs, even though they look the same.

Because all the relevant forms are feminine singular:

• את = you (said to one female)
• שומעת = feminine singular form of hearing
• תבדקי = feminine singular you will check / check

If you were speaking to a man, it would be:

אם אתה שומע קול מוזר, תבדוק אם יש בעיה.

In Hebrew, the present tense is often used for a general or ongoing situation, especially in instructions like this.

So אם את שומעת קול מוזר can mean something like:

• if you hear a strange sound
• if you are hearing a strange sound
• whenever you hear a strange sound

If you wanted to focus more on a future event, you could also say:

אם תשמעי קול מוזר...

That would also be natural.

Great question. Grammatically, תבדקי is the future form, but in everyday Hebrew, the future is very often used to give:

• instructions
• suggestions
• commands

So here תבדקי means something like:

• check
• you should check

The true imperative בדקי exists, but in modern spoken Hebrew it often sounds a bit more direct, formal, or sharper.
Using the future form is extremely common and natural.

יש means there is or there are.

So:

• יש בעיה = there is a problem
• אם יש בעיה = if/whether there is a problem

It is a very common Hebrew word used to express existence.

In Hebrew, adjectives usually come after the noun.

So:

• קול מוזר = a strange sound
• literally: sound strange

Also, the adjective has to agree with the noun in gender and number:

• קול is masculine singular
• so the adjective is מוזר (masculine singular)

If the noun were feminine, the adjective would change too.

Hebrew has no indefinite article. In other words, there is no separate word for a/an.

So:

• קול מוזר = a strange sound
• בעיה = a problem

If you want to say the, Hebrew does mark that:

• הקול המוזר = the strange sound
• הבעיה = the problem

So indefiniteness is usually just understood from context.

Sometimes Hebrew drops subject pronouns, but here את is useful and natural.

Why? Because שומעת is a present-tense form, and present tense in Hebrew does not show person clearly.
By itself, שומעת could mean something like hearing for different subjects depending on context.

So את makes it clear that the subject is you (feminine singular).

That is why אם את שומעת... sounds complete and clear.

It can mean both, depending on context.

• קול = voice
• קול = sound

In this sentence, it clearly means sound, because קול מוזר is talking about an unusual noise or sound.

If someone said יש לה קול יפה, then קול would mean voice:
She has a beautiful voice.

Here are the common versions:

• to a man:
  אם אתה שומע קול מוזר, תבדוק אם יש בעיה.

• to a group of men / mixed group:
  אם אתם שומעים קול מוזר, תבדקו אם יש בעיה.

• to a group of women:
  אם אתן שומעות קול מוזר, תבדקו אם יש בעיה.

Notice that Hebrew changes the pronoun and the verb endings to match gender and number.